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  3. The word "it" in line 3 refers to Why is "plankton" mentioned in line 17?

The word "it" in line 3 refers to Why is "plankton" mentioned in line 17?

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问题  The word "it" in line 3 refers to
  Why is "plankton" mentioned in line 17?
选项 A、To demonstrate the interdependence of different species
B、To emphasize the importance of food resources in preventing mass extinction.
C、To illustrate a comparison between organisms that live on the land and those that live in the ocean
D、To point out that certain species could never become extinct.
答案A
解析
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