Official 54 Lec 1
Question 6 of 6
What does the professor imply about the reasons for diel vertical migration in zooplankton?

A.

No single explanation for all species can account for this phenomenon.

B.

Researchers have not been able to propose plausible theories to explain this phenomenon.

C.

All individual organisms have several reasons for migrating.

D.

Researchers were able to agree on an explanation for this phenomenon after many years of investigation.

正确答案:A

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