Official 3 Lec 1
Question 4 of 6
What way of collecting information about migrating hummingbirds does the professor mention?

A.

Receiving radio signals from electronic tracking devices

B.

Being contacted by people who recapture banded birds

C.

Counting the birds that return to the same region every year

D.

Comparing old and young birds' migration routes

正确答案:B

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