how genetic drift,gene flow, natural selection, and mutations affect evolution

evolutionary effects

43098982	genetic drift	Chance events that may cause allele frequencies fo change unpredictably from one generation to another
43098983	gene flow	the transfer of alleles from one population to another, maybe causing genetic variation
43098984	natural selection	individuals in a population exhibit variations in their heritable traits, and those traits that are better suited for the environment tend to produce more offsprings
43098985	mutations	can cause a change in the phenotype and therefore produce an individual that is better suited for the environment