The pronoun "They" in the second paragraph refers to______.
A.ornithology and general biological science
B.contributions
C.professional biologists
D.birds
A、facilitated diffusion
B、pinocytosis
C、phagocytosis
D、receptor-mediated endocytosis
According to the passage, John Scopes was _______.
A.a professor teaching history.
B.a biology teacher from a high school in Tennessee.
C.a scientist famous for his theory of revolution.
D.convicted and free for violating the law.
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