New species form:

when subspecies diverge more and more

because of natural selection

when members of the same species become adapted to new environments

all of the above
13.
random changes in allele frequency in a population are called:

gene flow

genetic drift

microevolution

stabilizing selection
14.

the finches that darwin studied differed in the shape of their beaks. according to darwin, the finches probably:

all had a common ancestor

were born with identical beaks

were descended from similar birds in africa

ate the same diet