The questions "What are species?" and "How do we identify species ... In this page, you will learn about variation within gene pools, as well as the ways in which this variation can be an ...

This is called environmental variation. Humans, dogs and goldfish are examples of species. Different species have different characteristics from each other. For example, dogs have tails and humans ...

The variation within a single species has produced differences as large as those between two separate species. Some critics of the theory of evolution argue that it doesn't convincingly explain ...

Genetic variation within a population is measured according to the number of different alleles of all genes and the frequency with which they appear. Variation is high when there are many ...