How do populations evolve? - Answers

Populations evolve mainly in two ways: By natural selection and genetic drift Natural selection is the process by which forms of life having traits that better enable them to adapt to specific environmental pressures, as predators, changes in climate, or competition for food or mates, will tend to survive and reproduce in greater numbers than others of their kind, thus ensuring the perpetuation of those favorable traits in succeeding generations. Genetic drift is random changes in the frequency of alleles in a gene pool, usually of small populations.