Scientific organizations such as the American Association for the Advancement of Science describe microevolution as small scale change within species, and macroevolution as the formation of new species, but otherwise not being different from microevolution.

What is microevolution in science?

Definition. noun, plural: microevolutions. Evolution involving small-scale changes, i.e. within the species, occurring over a short period of time that results in the formation of new species.

Is microevolution proven?

It is important to first define what is meant by the word"evolution." There are actually two major theories of biological evolution: Microevolution - Unequivocally proven through numerous scientific studies. Includes concepts such as mutation, recombination, natural selection, etc.