As an environment changes over a period of time, due to natural selection, some individuals may possess certain traits which make them better adapted to live longer and produce more offspring.
Natural selection can be defined as the process whereby the population of living organism undergo changes in order to adapt well in an environment.
In any changes that occur in an environment, some individuals possess traits that make them survive better than other individuals. Therefore, those with certain traits that make them fitter, produce more offspring that survive, while those with traits that are disadvantaged become lesser in the environment.
In summary, we can say that, as an environment changes over a period of time, due to natural selection, some individuals may possess certain traits which make them better adapted to live longer and produce more offspring.
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