Which of the following is the best statement about natural selection? explain how you got your answer.

a. most populations of organisms evolve to become more and more alike, eventually becoming genetic clones

b. some individuals in a population have a variation that gives them an advantage to survive and reproduce.

c. if a population becomes isolated from others, the possibility for mutations to occur decreases and extinction results.

d. a stable environment and less variations in a population’s gene pool promotes evolution of new species.