Ecologists are concerned about amphibian populations because
A. amphibians are very sensitive to environmental change-they may be indicating serious problems.
B. their loss would be an aesthetic loss to the planet.
C. of the possibility of numerous medicinal uses.
D. they are keystone species in many areas-their loss will cause other populations to crash.
E. they are increasing to the point of competing with indigenous species.
Answer: A
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