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| | Top20Biology.com - Online Directory for Biology Education. |
 | | Nevertheless, the biological sciences are characterized and unified by several major underlying principles and concepts: universality, evolution, diversity, continuity, homeostasis, and interactions. |
 | | The central organizing concept in biology is that all life has a common origin and has changed and developed through the process of evolution, which led to the striking similarity of units and processes discussed in the previous section. |
 | | Evolutionary biology also makes use of paleontologists, who use the fossil record to answer questions about the mode and tempo of evolution, as well as theoreticians in areas such as population genetics and evolutionary theory. |
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