DNA Evidence in Evolutionary Trees

DNA evidence helps scientists map evolutionary relationships between living things. Early classification began with Aristotle in the 4th century BC and was later improved during the Renaissance and by Carolus Linnaeus in the mid-1700s. These systems grouped species by physical similarity, such as the presence or absence of a...

Humans have classified and organized biological organisms for thousands of years. Originally, primarily ordering objects necessary for survival. As human history progressed, so did the skill and detail in these classifications. In the fourth century B.C., Aristotle pioneered formal classifications, delineating plants and animals into different g...