Official 3 Lec 1
Question 5 of 6
What does the professor imply researchers have learned while studying hummingbird migration?

A.

Hummingbirds have totally disappeared from some countries due to recent habitat destruction

B.

Programs to replant flowers native to hummingbird habitats are not succeeding

C.

Some groups of hummingbirds have changed their migration patterns

D.

Some plant species pollinated by hummingbirds have become extinct

正确答案:C

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