Official 32 Lec 2
答题结果:0/6
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Question 4 of 6
How did the researchers test the links between acorns, white-footed mice, and gypsy moths in a forest?

A.

They supplied an additional food source for gypsy moths.

B.

They introduced gypsy moths to areas where there had been none.

C.

They cleared oak trees from some areas where both animal species lived.

D.

They manipulated the numbers of mice and acorns in some areas.

我的答案:

正确答案:D

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