Biological evolution is defined as any genetic change in a population that is inherited over several generations. These changes may be small or large, noticeable or not so noticeable.
Answer: Biological changes that occur along time or space with in a species are called microevolutionary. The basic factors responsible for them are: (a) mutation (changes in the genetic material); and (b) natural selection (the preservation of favorable and elimination of deleterious mutations).
