Across
- 1. a group of similar organisms that can produce fertile offspring
- 3. most well adapted pass on helpful characteristics to offspring
- 8. the naturalist that developed the theory of evolution through natural selection
- 9. more offspring than can survive are produced
Down
- 2. the strongest best adapted for environment mature and reproduce
- 4. struggle to get needed resources or mates
- 5. a trait that helps an organism survive in its environment
- 6. change over time
- 7. each of the offspring is slightly different