Read each example and identify it with one of the mechanisms that influence gene pools. A zebra migrates to join a different herd of zebras. Competition for sunlight leads to taller trees. The DNA of

Read each example and identify it with one of the mechanisms that influence gene pools. A zebra migrates to join a different herd of zebras. Competition for sunlight leads to taller trees. The DNA of a snake changes to make its venom stronger. A grassfire randomly sweeps through a population of buffalo and kills most of the animals.