Official 33 Lec 2
Question 4 of 6
What assumption did researchers use to draw conclusions about the Colorado River basin?

A.

Ancient tree ring data can only be obtained from dead trees.

B.

The climate in an area tends to remain constant over time.

C.

Rainfall has a limited impact on water flowing in rivers.

D.

Width of tree rings can correspond to the amount of moisture in an area.

正确答案:D

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