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tug-of -war; The tiny coral polyps feed on organisms that need sunlight to grow. So coral reefs are found only in warm, shallow ocean water. ... In fact, coral reefs are the largest natural structures ever built by living creatures in the wild.

tug-of -war; The tiny coral polyps feed on organisms that need sunlight to grow. So coral reefs are found only in warm, shallow ocean water. ... In fact, coral reefs are the largest natural structures ever built by living creatures in the wild.

tug-of -war; The tiny coral polyps feed on organisms that need sunlight to grow. So coral reefs are found only in warm, shallow ocean water. ... In fact, coral reefs are the largest natural structures ever built by living creatures in the wild.

tug-of -war; The tiny coral polyps feed on organisms that need sunlight to grow. So coral reefs are found only in warm, shallow ocean water. ... In fact, coral reefs are the largest natural structures ever built by living creatures in the wild.

格老子的~~這本書就我一個人讀過