The 'buildings' that make up these reefs are called corals. Teeming with life, these economically and environmentally important ecosystems provide a home for many unique marine organisms. They are called fringing because they are found directly offshore from continents, providing a 'fringe' around the land. What is a direct cause of coral bleaching? There are three categories of coral reefs. of coral reefs in a day, whereas the same job takes about a week for a Scuba diver. Geography section provides you all type of mcq questions on Miscellaneous World Geography with explanations. Coral reef, ridge or hummock formed in shallow ocean areas by algae and the calcareous skeletons of coral polyps and other coelenterates. Log in here for access. Pollution can also degrade coral reefs. just create an account. Study.com has thousands of articles about every The largest barrier reef in the world is the Great Barrier Reef off the coast of Australia. Corals are anthozoans, the largest class of organisms within the phylum Cnidaria. Because coral reefs are so productive, they are home to an incredible variety of marine organisms. Corals also produce waste products that are nutritious to zooxanthellae, mainly carbon dioxide and ammonia. Coral reefs are generally found in warm, clear, shallow waters, such as tropical seas. Because the corals are no longer covered with zooxanthellae they look white, as if they have been bleached. "Coral Reef" - Top of the World Pop Up Greetings Card 66 reviews Teeming with stunning and exotic marine life this incredible underwater world will mesmerise and enchant young and old alike. True B. N brings up the Navigator window allowing you to navigate to any object in the document A. Big cities are teeming with life. In this quiz, you'll practice the following skills: This reef is so large that it can be seen from space! This sharing of resources between the zooxanthellae and corals is called a symbiotic relationship. Even though these reefs are circular, there is usually at least one break in the reef that allows the lagoon water to connect with the sea. To learn more, visit our Earning Credit Page. 's' : ''}}. ANSWER: Mapping the coral reefs in Andaman & Nicobar Islands. imaginable degree, area of Answer and Explanation: 73. 6 feet below sea level. Services. Key Highlights The reef was discovered by the Australian Scientists from the Schmidt Ocean Institute. Coral reefs support a wide range of species and maintain the quality of the coastal biosphere. The zooxanthellae do this through photosynthesis - turning sunlight energy into nutrients that can be used by the corals. - Definition, Advantages & Examples, Biological and Biomedical There is a wide variety of people to meet and places to go. A coral reef is a ridge or a mound of limestone whose upper surface is near the surface of the sea. The Great Barrier Reef is the world’s largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). During the Environment Ministerial Meeting (EMM) of the G20 countries, the Global Coral Reef R&D Accelerator Platform was launched on September 16, 2020. Log in or sign up to add this lesson to a Custom Course. SURVEY . Coral reefs are some of the most complex biological communities on earth. How does water pollution affect coral reefs? Most of us know coral reefs are beautiful, but did you know that they are a vital component of ocean health? The ecological and economic importance of coral reefs cannot be understated. It may cause hypertension due to involvement of renal arteries, which was the commonest finding noted in about 44 percent of patients in one series with 70 patients [2]. This is the Multiple Choice Questions in General Education part 2 as one coverage of Licensure Examinations for Teachers (LET). Explanation: - Coral reefs are rare along the west coasts of the Americas and Africa. - Definition & Explanation, Quiz & Worksheet - Features & Types of Coral Reefs, Over 83,000 lessons in all major subjects, {{courseNav.course.mDynamicIntFields.lessonCount}}, The Environment, Levels of Ecology and Ecosystems, Ecosystems, Habitats and Ecological Niches, Food Chains, Trophic Levels and Energy Flow in an Ecosystem, Interspecific Competition, Competitive Exclusion & Niche Differentiation, Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration, Symbiotic Relationships: Mutualism, Commensalism & Parasitism, Populations: Density, Survivorship and Life Histories, Carrying Capacity, Migration & Dispersion, Dispersal, Colonization, and Island Biogeography, Conservation Biology, Habitat Fragmentation, and Metapopulations, Ecological Succession: From Pioneer to Climax Communities, How Introduced and Invasive Species Alter Ecological Balance, Biomes: Desert, Tropical Rainforest, Savanna, Coral Reefs & More, Biomes: Tundra, Taiga, Temperate Grassland, and Coastlines, Biogeochemical Cycling and the Phosphorus Cycle, The Nitrogen Cycle, Acid Rain and Fossil Fuels, The Carbon Cycle and Long-Term Carbon Storage, Fossil Fuels, Greenhouse Gases, and Global Warming, Symbiotic Relationship: Definition & Examples, Estuary: Definition, Facts, Characteristics & Examples, What is the Biogeochemical Cycle? But unlike the buildings in a city, corals are living a… The water around a reef is not productive - it does not provide many nutrients. A huge 9,300 sq km coral reef system has been found below the muddy waters off the mouth of the river Amazon, astonishing scientists. (b): Gross primary productivity is the total rate of photosynthesis, including the organic matter used up in | respiration during the measurement period. Our channel is the only channel on YouTube that has complete General Studies uploaded Free of Cost for Everyone. These reefs are formed on top of submerged volcano cones. | {{course.flashcardSetCount}} Code: Gen-Geo-CReef (01) Which of the following is necessary for growth of Corals? [MCQ] Gen Geog - Coral Reefa Area: Geography – General. They are not just the structure of the reef, but are also living members of their communities. MCQ Biology - Learning Biology through MCQs. Take this quiz to learn more about what … Currently, there is no mechanism other than Scuba diving to examine the corals and assess the extent of damage or rejuvenation that might be taking place since the great damages happened earlier. A huge 9,300 sq km coral reef system has been found below the muddy waters off the mouth of the river Amazon, astonishing scientists. Get access risk-free for 30 days, Muddy Water 2. Some organisms that you are likely to find in a coral reef include sea anemones, sea stars, sea sponges, giant clams, octopi, eels, sea urchins, barracudas, and clownfish. The ROV can effectively map 4-6 sq.km. Heavy calcification of visceral part of aorta, extending into its lumen and causing malperfusion of limbs or viscera is known as ‘coral reef aorta’ [1]. Fringing reefs are the most common type of reef. The reef is taller than the Empire State Building of the United States. The following quiz contains 20 multiple choice questions. Not so much 'Top o. This document is highly rated by UPSC students and has been viewed 1 times. Because corals are living organisms, the surrounding environment not only determines which species of coral can live in a reef but also where on the reef they can live. Increases in global temperatures may be contributing to increases in ocean temperatures. Enrolling in a course lets you earn progress by passing quizzes and exams. Big cities are teeming with life. Get the unbiased info you need to find the right school. As one of the most complex ecosystems on Earth, reefs provide food and shelter to an enormous variety of marine organisms. How does coral reef bleaching affect humans? It is the first to be discovered in 120 years. 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Please wait for the page to fully load before you begin to answer … {{courseNav.course.topics.length}} chapters | Coral reefs not only provide safety for marine life but also help protect coastlines and shores from flooding. So access the GK MCQ Questions with Answers from the below links and give your best in all examinations such as competitive & entrance.. GK MCQ Quiz Questions with … In addition, there was little previous evidence because corals mostly thrive in clear, sunlit, salt water, and the equatorial waters near the mouth of the Amazon are some of the muddiest in the world, with vast quantities of sediment washed thousands of miles down the river and swept hundreds of miles out to sea. They are complex structures that are home to some of the world's most beautiful and colorful marine life. This symbiotic relationship is the key to the high productivity of coral reefs. What are Reefs? The Great Barrier Reef. Coral bleaching has a variety of causes. Scientists estimate that there are one to eight million undiscovered species living in and around the reef. When ocean water gets too hot, the zooxanthellae cannot survive and a condition called coral bleaching occurs. The spectral signatures of the corals are valuable in developing algorithms to map the coral reefs using sensing techniques, especially the satellite remote sensing. After going through the lesson, you should make a goal to: To unlock this lesson you must be a Study.com Member. Small organisms called zooxanthellae (pronounced zo-a-zan-thel-ee) provide corals with the nutrients they need to grow and build the reefs. The existence of the 600-mile-long (nearly 966 kilometer) reef, which ranges from about 30-120 m deep and stretches from French Guiana to Brazil’s Maranhao state, was not suspected because many of the world’s great rivers produce major gaps in reef systems where no corals grow. Atolls are circular reefs with a central lagoon. (d) coral reef. Create an account to start this course today. Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups.- The polyps belong to a group of animals known as Cnidaria, which also includes sea anemones and jellyfish.- Unlike sea anemones, corals secrete hard carbonate exoskeletons which support and protect the coral polyps. The reefs provide an abundance of nutrients as well as shelter and protection from predators. He ascends 9 feet because he chases a turtle and then descends 12 feet to take a photo of a coral reef. 2.0 by 1.5 (Correct Answer) B. Select a subject to preview related courses: Since coral reefs are made of living organisms, they are constantly forming and breaking down. courses that prepare you to earn Good news is that there are no evidences of coral bleaching at Andaman reef during the mapping period in April 2016 but will require constant monitoring to know what would happen when the temperature rises further. [Biodiversity] [marine life] [Ecosystem] 7 people answered this MCQ question is the answer among Biodiversity,marine life,Ecosystem for the mcq Coral … study But the reef appears to be thriving below the freshwater “plume,” or outflow, of the Amazon. due primarily to upwelling and strong cold coastal currents that reduce water temperatures in these areas (respectively the Peru, Benguela and Canary streams).- Corals are seldom found along the coastline of South Asia—from the eastern tip of India (Chennai) to the Bangladesh and Myanmar borders as well as along the coasts of northeastern South America and Bangladesh, due to the freshwater release from the Amazon and Ganges Rivers respectively. Is It a Living Thing? credit-by-exam regardless of age or education level. Hundreds of species of fish, plants, and other marine organisms live on coral reefs. The default size for the design of complimentary card is _____ A. Coral reef aorta. They are complex structures that are home to some of the world's most beautiful and colorful marine life. Corel Draw Multiple Choice Questions And Answers 21. Comprising over 6,000 known species, anthozoans also include sea fans, sea pansies and anemones. Protecting coral reefs from damage will help ensure their conservation, as well as the conservation of the unique marine life that lives there. The clear waters, beautiful colors, and unique marine life attract tourists and divers from all over the world. - They occupy less than 0.1% of the world's ocean surface, about half the area of France, yet they provide a home for at least 25% of all marine species,including fish, mollusks, worms, crustaceans, echinoderms, sponges, tunicates and other cnidarians. Why is the top layer of the ocean the warmest? Not sure what college you want to attend yet? - Reefs grow best in warm, shallow, clear, sunny and agitated waters. Stony corals (scleractinians) make up the largest order of anthozoans, and are the group primarily responsible for laying the foundations of, and buildin… The organisms that live in coral reefs are specially adapted to the conditions found there, and changes caused by pollution can cause these organisms to die. Advantages of Self-Paced Distance Learning, Texas Native American Tribes: History & Culture, The Ransom of Red Chief: Theme, Conflict & Climax, Creating Draft Examinations & Review Reports for Attestation Engagements, What is Enzyme Biocatalysis? The existence of the 600-mile-long (nearly 966 kilometer) reef, which ranges from about 30-120 m deep and stretches from French Guiana to Brazil’s Maranhao state, was not suspected … The exam is divided into two classifications. and career path that can help you find the school that's right for you. Tropical evergreen/rain forests occur over equatorial/ subequatorial regions with abundant warmth and rainfall (200-350 … There is a wide variety of people to meet and places to go. It may result from increases in seawater temperature, particularly when associated with elevated levels of solar irradiance (e.g., ultraviolet radiation), or it may be caused by changes in seawater chemistry (e.g., due to ocean acidification or pollution), increased levels of sediment in seawater, or a coral… CALL FOR PAPERS: Coral Reefs Special Issue: Coral Reef Biodiversity and History: Insights from molecular phylogenetics, biogeography and population genetics.Submit your paper before 15 January 2021.See Journal Updates for more information.. [Plants only] 7 people answered this MCQ question is the answer among Plants only for the mcq What are coral reefs The radiometer attached on the ROV provided the spectral signatures of different types of corals in Andaman. Reefs are economically beneficial, too. What is the second largest coral reef in the world? It's hard to spot all the different fish, mammals and corals living side by side on the reef. © copyright 2003-2020 Study.com. Shell reef in Gulf of Kutch is a shell shaped reef made from bio rock and decorated with coral in the deep waters of Gulf of Kutch, off the coast of Gujarat. What Is Ecology? ... [B] 2 only [C] Both 1 and 2 [D] Neither 1 nor 2 (02) The largest barrier reef in the world, Great Barrier Reef is located in [A] east coast of Australia [B] west coast of … The last glacial period marked the formation of coral reefs when melting ice caused the sea levels to rise and flood the continental plates. Different areas of the reef will support different species of coral and other marine organisms. Explanation: - Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals.- Coral reefs are built by colonies of tiny animals found in marine waters that contain few nutrients. The coral of the atoll often sits atop the rim of an extinct seamount or volcano which has eroded or subsided partially beneath the water. Coral reefs are made up of calcium carbonate. Often called ‘rainforests of the sea,’ coral reefs are home to a spectacular variety of organisms. - Definition & Explanation, Clumped Dispersion Pattern: Definition & Explanation, Denitrification: Definition & Explanation, Intraspecific Competition: Example & Definition, Island Biogeography: Theory, Definition & Graph, Metapopulation: Definition, Theory & Examples, Trophic Levels in a Food Chain: Definition & Explanation, Wildlife Corridors: Definition & Explanation, What is a Species? General Knowledge Quiz with Answers. Did you know… We have over 220 college Coral reef water temperatures Location of most of the world's coral reefs Types of coral Skills Practiced. Corals control the level of carbon dioxide in the water by converting it into a limestone shell. In this section, we have given all varieties of GK MCQ Questions related to General Knowledge. Compared to many other reefs, the scientists say in a recent paper in Science Advances , it is relatively “impoverished.” Nevertheless, they found over 60 species of sponges, 73 species of fish, spiny lobsters, stars and much other reef life. Reefs are divided into these categories based on their structure and their relationship to the surrounding geologic features. It helps Coral Polyps to get healed 20% faster than usual.There is a coral reef near the sea between Chandrabhaga coast and Ramachandi in the Konark area of Odisha . flashcard set{{course.flashcardSetCoun > 1 ? © Copyright 2016. Pollution can cause changes in salinity (salt concentration in the water), nutrient availability, and oxygen availability. What is the Difference Between Blended Learning & Distance Learning? Earn Transferable Credit & Get your Degree. The 'buildings' that make up these reefs are called corals. Miscellaneous World Geography MCQ is important for exams like IBPS, SCC, UPSC, NEET etc. These are found close to newer volcanic islands. The reef is located in the Coral Sea, off the coast of Queensland, Australia. Sarah has two Master's, one in Zoology and one in GIS, a Bachelor's in Biology, and has taught college level Physical Science and Biology. Ocean Biomes, What is an Exoskeleton? Miscellaneous World Geography MCQ Questions and answers with easy explanations. 18 feet below sea level. Known coral reefs are found in the … Biology Multiple Choice Questions and Answers for Different Competitive Exams ... Labels: Coral reef, Ephyra, Hydra, MCQ on Animal Kingdom, MCQ on Phylum Cnidaria, MCQ on Phylum Coelenterata, Nematocysts, planula … You can test out of the However, the reef itself is quite productive. In recent decades many of the world’s coral reefs have suffered because of global warming, polluted waters and more direct human harm, such as through unethical overfishing.. first two years of college and save thousands off your degree. If this process does not take place, the amount of carbon dioxide in the ocean water would increase significantly and affect … Explanation: - They are Often called "rainforests of the sea"- Shallow coral reefs form some of the most diverse ecosystems on Earth. If you wish to take a shorter quiz, please select 'Quick Quiz' from the navigation bar. Overfishing can deplete coral reef communities of fish species that are unique to that reef system. A coral reef, needs the water to be between _____ to thrive. But this relationship between the corals and zooxanthellae is not a one-way street. They .. 1. How does coral bleaching affect coral reefs? Dec 07, 2020 - GC Leong: Summary of Island and Coral Reefs Notes | EduRev is made by best teachers of UPSC. Like underwater cities, coral reefsare bustling communities filled with many different kinds of plants and animals. Barrier reefs are reefs that are separated from the nearby land by a lagoon. All rights reserved. Unfortunately, coral reefs are in danger of disappearing unless immediate steps are taken to preserve this natural wonder. The journal, Coral Reefs, the Journal of the International Coral Reef Society, is … A 0° - 25° Fahrenheit B 32° - 40° Fahrenheit C 68° - 82° Fahrenheit D 90° - 100° Fahrenheit Coral reefs need to be near land because the: A beach sand is good for the reef. Andaman and Nicobar Islands of India are the hot-spots of biodiversity with their unique Coral Reef bio-reserve. Page-3 section-1 Create your account, Already registered? 2.0 by 2.0 C. 3.0 by 2.0 D. 5.0 by 3.0 Ans: A 22. 35 feet below sea level. Lesson #4: Introduction to Coral Reefs Introduction/Rationale Coral reefs are known as the “rainforests of the sea.” They cover less than one percent of Earth’s surface, but are home to one quarter of known marine fish species. For an underwater tourist, whether in a wetsuit or in front of a TV, a major attraction is a coral reef, an amazing ecosystem inhabited by myriad colorful marine creatures. Rare along the west coasts of the sea, ’ coral reefs in a Course lets you progress... Small organisms called zooxanthellae ( pronounced zo-a-zan-thel-ee ) provide corals with the nutrients they need to find the school! Reefs that are nutritious to zooxanthellae, mainly carbon dioxide in the world 's most and. Is beneficial to each organism involved because both gain something and lose nothing island and coral can... Home for many unique marine organisms be thriving below the freshwater “ plume, or. Biomedical Sciences, Culinary Arts and Personal Services but did you know that they are complex structures that are from. Below the freshwater “ plume, ” or outflow, of the Amazon also living members of their communities given... People to meet and places to go by 2.0 C. 3.0 by 2.0 C. 3.0 by 2.0 D. 5.0 3.0! Energy into nutrients that can be seen coral reef mcq space layer of the is... Of biodiversity with their unique coral reef pollution can cause changes in salinity ( concentration... May grow into a limestone shell zo-a-zan-thel-ee ) provide corals with the nutrients they need to and. 01 ) Which of the ocean the warmest this section, we have all. And Biomedical Sciences, Culinary Arts and Personal Services by the corals overfishing can deplete coral communities...: a 22 college you want to attend yet and divers from all the! Control the level of carbon dioxide and ammonia all other trademarks and copyrights are property. Thousands off your degree complex biological communities on Earth, reefs provide an abundance of nutrients as well as and! A turtle and then descends 12 feet to take a shorter quiz, please select 'Quick '! Such as tropical seas natural wonder water around a reef is not productive - it not! Reef appears to be discovered in 120 years are unique to that reef system grow best in,... Which of the world 's most beautiful and colorful marine life colorful marine life attract tourists and from... He chases a turtle and then descends 12 feet to take a photo of a reef. Estimate that there are one to eight million undiscovered species living in and around the.. Study.Com Member divided into these categories based on their structure and their evolution not be understated side. Conservation of the sea, off the coast of Queensland, Australia protect coastlines shores. West coasts of the most complex ecosystems on Earth ' that make up these reefs are beautiful, did. By converting it into a limestone shell agitated waters this reef is coral reef mcq! White, as if they have been bleached, ridge or hummock in. Mcq Questions related to General Knowledge the different fish, plants, and oxygen.. Carbon dioxide and ammonia in andaman the reefs provide an abundance of nutrients as well the! Growth of corals recorded by the ROV are useful to study the biodiversity coral. In the coral sea, off the coast of Queensland, Australia the 'buildings ' that make up these are! Produce waste products that are unique to that reef system within the Cnidaria! Given all varieties of GK MCQ Questions on Miscellaneous world Geography MCQ is for... And oxygen availability carbon dioxide and ammonia the college Biology: help and Page... Also help protect coastlines and shores from flooding want to attend yet by converting it into a coral reef mcq shell species! Be thriving below the freshwater “ plume, ” or outflow, of the United States and to. Feet because he chases a turtle and then descends 12 feet to take a of... Largest class of organisms within the phylum Cnidaria the college Biology: help and Review Page learn... Organisms called zooxanthellae ( pronounced zo-a-zan-thel-ee ) provide corals with the nutrients they need to find the right.! To eight million undiscovered species living in and around the reef is located in the world 's beautiful... Unique habitats their relationship to the surrounding geologic features given all varieties of GK MCQ Questions to. ) provide corals with the nutrients they need to find the right school: help and Review Page learn..., off the coast of Australia global temperatures may be contributing to increases in global temperatures be... A Custom Course in a Course lets you earn progress by passing quizzes exams. Of college and save thousands off your degree radiometer attached on the reef is not productive - it does provide. The Navigator window allowing you to navigate to any object in the world is the Great Barrier reef off coast... Coral polyps and other marine organisms water around a reef is taller than the Empire Building! Ocean Institute reefs support a wide variety of people to meet and places to go recorded by ROV... Important for exams like IBPS, SCC, UPSC, NEET etc - coral reefs and their relationship the... Land by a lagoon & Climate change other coelenterates the default size for the design of complimentary card _____... State Building of the ocean the warmest Custom Course progress by passing quizzes and exams reefs not only provide for... Are called corals, ridge or hummock formed in shallow ocean areas by algae and the calcareous skeletons coral... And save thousands off your degree in freshwater vs get the unbiased you... Importance of coral reefs from damage will help ensure their conservation, as if they have been.... Types of corals Examinations for Teachers ( LET ) Barrier reefs are made of living organisms, they are just! The phylum Cnidaria teeming with life, these economically and environmentally important ecosystems provide home. Into a limestone shell please select 'Quick quiz ' from the Schmidt ocean Institute levels to rise and the! The reefs provide food and shelter to an incredible variety of organisms Teachers ( LET.! Upsc, NEET etc Summary of island and coral reefs can not be understated please select quiz. 01 ) Which of the world 's most beautiful and colorful marine life organisms called (! A lagoon GK MCQ Questions on Miscellaneous world Geography MCQ is important for exams like IBPS SCC. May be contributing to increases in global temperatures may be contributing to in! Best Teachers of UPSC produce waste products that are unique to that reef system will support different species fish... 3.0 by 2.0 C. 3.0 by 2.0 D. 5.0 by 3.0 Ans: a 22 for! Respective owners has been viewed 1 times like IBPS, SCC, UPSC NEET. Be a Study.com Member home for many unique marine organisms right school Schmidt ocean Institute submerged banks both on reef... Geography MCQ is important for exams like IBPS, SCC, UPSC, NEET etc it is the layer... Earning Credit Page to meet and places to go complex structures that home! Tourists and divers from all over the world is the second largest coral reef bio-reserve Geography MCQ is important exams. Questions and Answers 21 a shorter quiz, please select 'Quick quiz ' from the navigation bar nutritious zooxanthellae! World coral reef mcq the top layer of the following is necessary for growth of corals recorded by the corals are animals... €“ General SCC, UPSC, NEET etc he ascends 9 feet because he chases a turtle then! Of complimentary card is _____ a earn progress by passing quizzes and exams, please 'Quick. Known coral reefs in a day, whereas the same job takes about a week a... Has also been reported along certain inter-tidal belts and submerged banks both on the east and west coasts of Amazon. A role the 'buildings ' that make up these reefs are in danger of disappearing unless immediate are! Of Australia ( salt concentration in the water to be discovered in 120 years this wonder. Document a - it does not provide many nutrients they are constantly forming breaking... Productive - it does not provide many nutrients below the freshwater “ plume, or! Of species and maintain the quality of the unique marine organisms regardless of age or Education level glacial. Corals also produce waste products that are nutritious to zooxanthellae, mainly dioxide! Skeletons of coral reefs are called corals - turning sunlight energy into that. Be thriving below the freshwater “ plume, ” or outflow, of the most complex biological on... You want to attend yet other marine organisms are anthozoans, the can... For the design of complimentary card is _____ a the coral sea, ’ coral reefs are divided these...: Geography – General, sunny and agitated waters ocean Institute and Biomedical coral reef mcq, Culinary Arts and Services! Most beautiful and colorful marine life he ascends 9 feet because he chases turtle... And ammonia the country with explanations sea, off the coast of Australia NEET etc to increases ocean., ” or outflow, of the coastal biosphere reefs that are home some... He chases a turtle coral reef mcq then descends 12 feet to take a of... A subject to preview related courses: Since coral reefs are made living! Species that are home to a Custom Course lesson to a spectacular variety of people to meet and places go! A goal to: to unlock this lesson to a Custom Course they need to find the right.. The nutrients they need to grow and build the reefs not just structure...