Extinction happens for many reasons. all but one is a reason for a species to become extinct. that is
a) a species is unable to adapt to changes in the environment.
b) a species is introduced to an area without natural predators.
c) a species is destroyed by human activity such as over-hunting.
d) a species of rat is wiped out when a new disease is introduced.

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4