Evolutionary biologists, teamed up with anthropologists and medical researchers, have identified over ________ species of plants that have been used by humans as medicines.
A) 20
B) 1,000
C) 5,000
D) 20,000
E) 250,000

Question

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Evolutionary biologists, anthropologists, and medical researchers have identified over 20,000 species of plants that humans have used for medicinal purposes.

Evolutionary Biologists, Teamed Up with Anthropologists and Medical Researchers, Have