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Question

珊瑚礁的主体是由珊瑚虫组成的。珊瑚虫是海洋中的一种腔肠动物，它以捕食海洋里细小的浮游生物为食，在生长过程中能吸收海水中的钙和二氧化碳，然后分泌出石灰石，变为自己生存的外壳。每一个单体的珊瑚虫只有米粒那样大小，它们一群一群地聚居在一起，一代代地新陈代谢，生长繁衍，同时不断分泌出石灰石，并粘合在一起。这些石灰石经过以后的压实、石化，形成岛屿和礁石，也就是所谓的珊瑚礁。由于珊瑚虫具有附着性，许多珊瑚礁的底部常常会附着大量的珊瑚虫。

Answer 1

The subject of the coral reef is composed of coral polyps. The coral polyp is a kind of coelenterate in the ocean, it, in order to pray on the tiny planktonic organism in the ocean as the food, can absorb calcium and carbon dioxide in the sea water in the course of growing, then secrete out the lime stone, turn into the outer cover that oneself survives. Every single coral polyp afford to have only grain of rice size, they first one like that, generation upon generation of ground metabolism, grow and multiply, is secreting out the lime stone constantly at the same time, and conglutination is together. The lime stone forms island and reef through the debulk for the future, petrochemical industry, only so-called coral reef. Because the coral polyp has adhering to nature, the bottoms of a lot of coral reeves will often adhere to a large number of coral polyps.