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- Organic evolution is the emergence of organisms gradually from pre-existing ones over a long period of time.
- Organic evolution suggests that the present species of organisms developed from pre-existing earlier forms as a result of accumulation of small changes in the body structure and complexity over a long period of time.
- Several evidences point to a common ancestry. They include:
- Fossil rerecords
- Comparative embryology
- Comparative anatomy
- Cell biology
- Comparative serology
- Geographical distribution
What are fossils?