问题:
A、Ants bring about a negative influence to an area when their population is small.
B、Ants bring about a positive influence to an area when their population is small.
C、Ants'predation counteracts the positive influence they may have on an area.
D、At higher density,ants produce a positive influence on an area.
B、Ants bring about a positive influence to an area when their population is small.
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