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.
plankton: sinh vật phù du.
Đáp án là A. Ý trong bài: Mass extinctions can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species.
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