Across
- 2. The complete collection of fossils discovered.
- 3. Preserved remains of once-living organisms.
- 5. Comparing the structures of different organisms is called ___ anatomy.
- 7. A major theory explaining how organisms change over time.
- 9. Early human embryos grow a temporary ___.
- 11. The __ on a whale’s skull that changed position over time.
- 12. Organisms with similar ___ are more closely related.
- 13. Unborn or unhatched babies are called ___.
Down
- 1. Any living thing.
- 4. Scientists who study how organisms grow and change before birth.
- 6. The skeletal system of humans is similar to that of dolphins and bats, showing they share a common __.
- 8. (e.g., arms, legs)
- 10. The study of the structures of living things.