The author states that birds left the tropics because ______.A.there was not enough food t

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The author states that birds left the tropics because ______.

A.there was not enough food there in the winter

B.there were too many birds

C.there were too many glaciers

D.there was too much daylight

请帮忙给出正确答案和分析,谢谢!

热搜:the galapagos islands