Across
- 3. occurs when species evolve together
- 8. arise by mutation
- 10. a trait that helps an organism survive in its environment
- 12. similar features in organisms with same functions, but not from the same ancestors
- 13. complete disappearance of a species
- 14. process of changing to adapt
- 18. differences in organisms
- 19. asexual reproduction of the body into two new bodies
- 20. similar structures evolved from the same ancestor
Down
- 1. interbreeding from one species to another
- 2. germs build immunity to treatment
- 4. can only reproduce in a host
- 5. a cell that has a nucleus
- 6. a response to a stimulus in order to survive
- 7. is when a group separates from a larger group and develops its own characteristics
- 9. single-cell organisms possessing a prokaryotic
- 11. offspring produced by one parent
- 15. physical changes in order to adapt to an environment
- 16. random change in gene variant
- 17. smaller cells without a nucleus