The most important kind of selection acting on a well-adapted population in a relatively constant environment is:

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Stabilizing selection is the most important kind of selection acting on a well-adapted population in a relatively constant environment. This type of selection favors the average individuals in a population and selects against extreme variations, which maintains the overall fitness and adaptation of the population. Disruptive selection favors extreme variations, directional selection favors one extreme variation over the average, and catastrophic selection is a sudden and drastic decrease in population size due to environmental factors.

The Most Important Kind of Selection Acting on a Well-Adapted