Natural selection is really a resultof any system that has: 1. Variation (i.e., differences in heritable traits that affect "Fitness" = the ability to survive and reproduce) B.

Natural Selection Definition Natural selection is the process that causes groups of organisms to change, or evolve, over time.

Its main premise is that when there is a trait that allows one individual to better survive in an environment than another, the former is more likely to reproduce.

Natural selection is one of the four basic premises of evolutionary theory, alongside mutation, migration and genetic drift. A. In natural selection, those variations in the genotype (the entire complex of genes inherited from both parents) that increase an organism’s chances of survival and procreation are preserved and multiplied from generation to generation at the expense of less advantageous variations. Considering that animals must in Natural selection is a pressure that causes groups of organisms to change over time. Natural selection works on populations with a variation in traits, such as coloring.

Heredity (i.e., the ability to pass traits on to offspring) 2. Reproduction (i.e., the ability to multiply and thereby increase population size) 3.