AP BIOLOGY

Detailed explanation-1: -Scientists think that species with a shorter evolution evolved mostly by punctuated equilibrium, and those with a longer evolution evolved mostly by gradualism. Gradualism is selection and variation that happens more gradually. Over a short period of time it is hard to notice.

Detailed explanation-2: -Gradualism in biology and geology refers most broadly to a theory that changes of organic life and of the Earth itself occur through gradual increments, and often that transitions between different states are more or less continual and slow rather than periodic and rapid.

Detailed explanation-3: -: the evolution of new species by gradual accumulation of small genetic changes over long periods of time. also : a theory or model of evolution emphasizing this compare punctuated equilibrium.

Detailed explanation-4: -Evolution: Evolution consists of changes in the heritable traits of a population of organisms as successive generations replace one another. It is populations of organisms that evolve, not individual organisms.

Detailed explanation-5: -A great example of evolutionary gradualism is the lineage of whales. Whales gradually evolved over the course of tens of millions of years from four legged land mammals to aquatic mammals.