Each organism in a population produces more offspring than can survive. this is called . in order for natural selection to occur, populations must have . when the environment changes, nature selects favorable . over time, these in a population.

Explanation:

Each organism in a population produces more offspring than can survive. This is called overproduction. In order for natural selection to occur, populations must have variation. When the environment changes, nature selects favorable adaptations. Over time, these build up in a population.

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