百度试题 结果1 题目The material commonly called coral is made of .A. shells B. reefs C. polyps D. cement 相关知识点: 试题来源: 解析 C 反馈 收藏
解析 B。The Great Barrier Reef is made up of coral. Option A, rocks, are not the main component of the Great Barrier Reef. Option C, sand, is not what the Great Barrier Reef is made of. Option D, volcanic ash, is not relevant to the formation of the Great Barrier Reef....
The Great Barrier Reef is made of coral, a colorful rock-like substance actually composed of many small marine animals, each one less than half a centimeter in size. Coral grows in colonies that can reach over a meter and a half in height, and several of these colonies grow in close pro...
following day (when the coral polyp is retracted and lying on its new structure), the valleys between the ridges fill in with more calcium carbonate and the skeleton takes on a smoother appearance.Because the skeleton of hard corals is made of limestone or calcium carbonate, it is pure white...
following day (when the coral polyp is retracted and lying on its new structure), the valleys between the ridges fill in with more calcium carbonate and the skeleton takes on a smoother appearance. Because the skeleton of hard corals is made of limestone or calcium carbonate, it is pure ...
百度试题 结果1 题目( ) 3. A coral reef is made up of(由……组成) many other small animals.相关知识点: 试题来源: 解析 T 反馈 收藏
A. piece B. pieces C. piece's D. pieces' 相关知识点: 试题来源: 解析 B。本题考查名词的复数形式。“piece”是可数名词,“thousands of”后面要用名词复数形式“pieces”。“piece's”和“pieces'”是所有格形式,不符合题意。反馈 收藏
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Most corals, like other cnidarians, contain a symbiotic algae called zooxanthellae, within their gastrodermal cells. ... In return,the algae produce oxygenand help the coral to remove wastes. Is coral harmful to humans? The most dangerous chemical compound released by coral is called apalytoxin....