Which two factors could lead to the evolution of a species over time?

2) Evolution is the result of mutations and recombination, only. 3) Organisms best adapted to a changed environment are more likely to reproduce and pass their genes to offspring. 4) Asexual reproduction increases the survival of species.

There are four forces of evolution: mutation, gene flow, genetic drift, and natural selection. Mutation creates new genetic variation in a gene pool. Gene flow and genetic drift alter allele frequencies in a gene pool.