LIFE SCIENCE

Detailed explanation-1: -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-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: -So, the correct answer is ‘Gradualism’.

Detailed explanation-4: -Within biology, gradualism is defined as the evolutionary process in which species experience changes in characteristics slowly and incrementally.

Detailed explanation-5: -Gradualism is selection and variation that happens more gradually.