What are coral reefs formed by? A. The soft bodies of polyps. B. The hard skeletons of polyps. C. The shells of fish. D. The rocks in the ocean. 相关知识点: 试题来源: 解析 B。解析:文章中明确提到“Coral reefs are formed by the accumulation of the hard skeletons of tiny sea ...
美取治可特认上回且五体少走工名美取治可特认上回且五体少走工名What are coral reefs formed by?美取治可特认上回且五体少走工名美取治可特认上回且
Coral reefs are 'used' by people for several different things. They are the source of organisms which are harvested by scientists who use them to...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough ...
Class 11 BIOLOGY What are coral reefs ?... What are coral reefs ? Video Solution Struggling with Ecosystem ? Get free crash course Text SolutionVerified by Experts Rocks formed in the coastal seas by calcareous secretions of cnidarian polyps. Show More ...
Coral reefs are underwater structures that act as an aquatic ecosystem and help protect coastal areas from erosion. Discover facts about coral reefs types, as well as their importance and conservation efforts. Definition Big cities are teeming with life. There is a wide variety of people to me...
B. Tiny coral polyps. C. Sea turtles. D. Divers. 相关知识点: 试题来源: 解析 B。中文解析:文章中明确提到“The coral reefs themselves are like underwater cities, built by tiny coral polyps over a very long time.”,所以珊瑚礁是由珊瑚虫建造的,故选B。
What are coral reefs? A. Home to only a few species of fish. B. Ugly and not diverse. C. One of the most beautiful and diverse parts of the marine ecosystem. D. Not important for the E. cosystem. 相关知识点: 试题来源: 解析 C。解析:“Coral reefs are one of the most beautiful...
Coral Reefs: Coral belong in the phylum Cnideria and are formed by colonies of coral polyps. The polyps are held together by calcium carbonate. Coral reefs can be found in tropical oceans near the equator. Coral reefs are homes to many marine life, including crabs, fish, shrimp, sea urchin...
Many reefs result from natural, abiotic processes—deposition of sand, wave erosion planing down rock outcrops, etc.—but there are also reefs such as the coral reefs of tropical waters formed by biotic processes dominated by corals and coralline algae, and artificial reefs such as shipwrecks ...
D.reefs formed by soft corals 5.According to paragraphs 3 and 4, the corals considered to be the most valuable are those that A.secrete limestone crystal structures B.attach themselves to rubbery surfaces C.contain little limestone D.grow in the deepest waters ...