Darwin did not know that DNA would become an important part of his Theory of Evolution.

about 100 bones and fragments.

The amount of difference in DNA is a test of the difference between one species and another – and thus how closely or distantly related they are.

DNA evidence confirms Darwin's central hypothesis: that heritable variation arises continually and is gradually accumulated, making lineages steadily diverge from each other

organs or skeletal elements of animals and organisms that, by virtue of their similarity, suggest their connection to a common ancestor.

features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature

the identification by humans of desirable traits in plants and animals, and the steps taken to enhance and perpetuate those traits in future generations.

a measure of how well differences in people's genes account for differences in their traits.

a biological structure that has lost a major ancestral function and is usually drastically reduced in size.

the action or process of adhering to a surface or object.