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It is called natural selection.

The individuals with the best properties needed for survival in an environment are the most likely to survive, and to pass on their genes.

In this way the offspring will have properties that are useful in an environment.

In theory the population will start to move more and more towards having useful properties for their specific environment and circumstances.

If the environment changes, the individuals that are most likely to survive will also change, and probably different properties will be favored this time.

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16y ago

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