Natural selection is a natural process in which animals better adapted to their environment tend to survive and produce more offspring. This increases the percentage of their genes in the gene pool. Animals which are lesser suited tend to die earlier and as a result produce fewer offspring, therefore the genes they carry tend to diminish within the population.

Natural selection helps species of animals survive. A species chance of survival increases because animals, which have defects, tend to die earlier thereby producing fewer offspring, while the animals with "beneficial" genes will tend to live longer and produce more offspring. Natural selection becomes most important when the environment of a species changes.

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