AP BIOLOGY

Detailed explanation-1: -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-2: -Gradualism is selection and variation that happens more gradually.

Detailed explanation-3: -Phyletic gradualism is a model of evolution which theorizes that most speciation is slow, uniform and gradual. When evolution occurs in this mode, it is usually by the steady transformation of a whole species into a new one (through a process called anagenesis).

Detailed explanation-4: -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.