The expression of genes in an organism can be influenced by the environment, adding the external world in which the organism is or where it develops, as well as the organism's internal world, which includes such factors as its hormones and metabolism.
Following are the best conditions or examples for the natural selection to occur:
• More organisms are born than can survive.
• Organisms vary in their characteristics, even within a species.
• Differences in reproduction and survival are due to variation among organisms.
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All the animals and plants that die as a result of their ecosystem being destroyed.