Species can reproduce either asexually or sexually, depending on the state of the environment. Asexual reproduction tends to occur in stable, favorable environments; sexual reproduction is more common in unstable or unfavorable circumstances.© BrainMass Inc. brainmass.com October 9, 2019, 6:04 pm ad1c9bdddf
Evolution is a function of three events - variation, natural selection and isolation working in a co-operative and sequential manner. Variations, in fact, produce raw material for the evolutionary forces like natural selection and isolation ...
Sexual reproduction results in variation which adds to the survival value of species.