 Selection - Mechanisms of selection: Encyclopedia II - Selection - OverviewWhether or not selection takes place depends on the conditions in which the individuals of a species find themselves. Adults, juveniles, embryos, and even eggs and sperm may undergo selection. Factors fostering selection include limits on resources (nourishment, habitat space, mates) and the existence of threats (predators, disease, adverse weather). Biologists often refer to such factors as selective pressures.
Natural selection is the most familiar type of selection by name. The breeding of dogs, cows and horses, however, rep ...
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