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