In peas, yellow seed color (V) is dominant to green seed color (y). Which describes an organism that has nonidentical alleles for seed color?
yy and has green seeds
O Yy and has yellow seeds
OYY and has yellow seeds
O Yy and has green seeds

According to Darwin's Theory of Natural Selection, each generation produces more individuals than the ecosystem can sustain. However, not all individuals are identical and phenotypical variation exists.

Due to this variation, some antelopes are better at escaping lions, perhaps due to speed and/or stamina. Thus, the individuals that are slower and thus less fit will be killed and eliminated from the herd. The antelopes with heritable traits that makes them better suited to the environment, will escape and thus, survive and reproduce.

In Darwin's Theory predation is an evolutionary force.