What is an example of bottom-up population regulation?
A. A drought causes grasses to decline, which reduces the number of grasshoppers. In turn, this reduces the number of shrews B. In a freshwater stream, bass prey on snail darters. The darters hide in rocky shelters, where crayfish prey on them. As a result, the darter population declines. C. Bald eagle populations decline as a result of bioaccumulation of DDT in their bodies. As a result, the rat population of the region increases.