
Originally Posted by
Raistlin
Holy crap, if random mutations and natural selection can make changes within a generation...if a population is split for some reason (natural disaster, migration, etc.), the two new populations could eventually become so different as to be unable to breed, and become completely different species!
We've also witnessed speciation. Oh, and there is no definite line where "macroevolution" starts. It's scientifically defined as "changes [microevolution] to a population over time." So microevolution logically entails macro.