Across
- 2. A trait that helps a species become better suited to its environment.
- 4. Organs that are similar in different species due to them having a common ancestor.
- 6. Another term for artificial selection.
- 7. This is how well an organism can survive and reproduce in its environment.
- 11. Organs that no longer have a use or do not have their original use.
- 12. When a species disappears permanently from Earth.
- 13. A well tested hypothesis supported by evidence.
Down
- 1. This states that all living organisms share 1 common ancestor.
- 2. When humans choose which seeds to plant or animals to breed to select desirable characteristics.
- 3. This is sometimes called "survival of the fittest."
- 5. Any natural change that occurs to genetic material.
- 8. A group of organisms that are closely related and can mate to produce fertile offspring.
- 9. Preserved remains that help humans know what life was like a long time ago.
- 10. Organisms changing over time.