Across
- 2. arise by mutation
- 4. can only reproduce in a host
- 6. skeletal elements suggest common ancestors
- 8. occurs when species evolve together
- 11. membrane-bound cell
- 12. when a group separates from a larger group and develops its own charasteristics
- 15. any trait that helps an organism survive in its environment
- 16. when germs can resist treatment
- 17. differences in organisms
- 18. offspring produced by one parent
- 19. asexual reproduction of the body into two new bodies
Down
- 1. process of changing to adapt
- 3. a cell that has a nucleus
- 5. a response to a stimulus in order to survive
- 7. interbreeding from one species to another
- 9. complete disappearance of a species
- 10. physical changes in order to adapt to an environment
- 13. random change in gene variant
- 14. single cell organism possessing a prokaryotic