单选题
Why is "plankton" mentioned in line 17?
A、
( To demonstrate the interdependence of different species
B、
( To emphasize the importance of food resources in preventing mass extinctio
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 extinc
【正确答案】
A
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