Answer:Many birds are monogamous, meaning that one male and one female mate for an entire breeding season. Other animals are naturally polygamous, meaning one female has the opportunity to mate with many males or one male mate with multiple females.
Having variation within a species means that if the environment changes there may be individuals within the species more able to withstand the change and survive. A disease or change in enviroment is less likely to affect all the individuals in a population.
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