A. It reflects the interrelationship of may species.
B. It may depend on chance events.
C. It does not vary greatly from species to species
D. It is associated with astronomical conditions.
B
Chọn B
THông tin ở đoạn 3: “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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