Which of the following statements about extinction is TRUE?
A. Overexploitation by hunting and fishing is the biggest threat to tropical animals and plants.
B. Introduction of new exotic species should help increase biodiversity, slowing species extinctions.
C. Commercial hunting and fishing are always careful not to deplete animal reserves.
D. Wild species often become extinct due to different combinations of factors.
E. Without human activity, all species would survive and there would be no extinctions.
Answer: D
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