Some birds like to sit on a sheep because______. We learn from the text that corals depend on plants for______.

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问题 Some birds like to sit on a sheep because______.
We learn from the text that corals depend on plants for______.

选项 A、comfort
B、light
C、food
D、oxygen

答案D

解析 从文章第二段第四句,In their skins...giving in return oxygen which the animal needs to breathe可知,植物为动物提供了生活必需的氧气。所以正确的答案为D。
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