Across
- 1. Changes in DNA that can help or hurt organisms.
- 3. A group of similar organisms that can breed and produce fertile offspring.
- 6. Producing more offspring than will survive.
- 7. An organism's physical appearance.
- 8. Ability of an organism to survive and reproduce.
Down
- 2. A trait that is passed down and helps an animal survive and reproduce.
- 4. A difference between individuals of the same species.
- 5. An organism's genetic makeup.