Across
- 2. A chart that divides Earth's history into different units.
- 3. The breeding of organisms for desired characteristics.
- 4. An adaption that enables a species to blend in with their environment.
- 7. Made up of all the fossils ever discovered on Earth.
- 9. A person who studies plants and animals by observing them.
- 11. The preserved evidence of the activity of an organism.
- 14. A slight difference in an inherited trait of individual members of a species.
- 15. A fossil copy of an organism in a rock.
- 17. The science of development of embryos from fertilization to birth
- 19. The process by which populations of organisms with variations that help them survive in their environments live longer, compete bigger, and reproduce more than those who do not have the variations.
Down
- 1. Body parts that have lost their original function through evolution.
- 5. The body parts of organisms that are similar in structure and position but different in function.
- 6. An inherited trait that increases an organism's chance of surviving and reproducing in its environment.
- 8. The study of similarities and differences among structures of living species.
- 10. The change over time in populations of related organisms.
- 12. Body parts that perform a similar function but differ in structure.
- 13. Occurs when the last individual organism of a species dies.
- 16. The resemblance of one species to another species.
- 18. The impression of an organism in a rock.