Across
- 2. a group of similar organisms that can mate
- 4. selection individuals better adapted to environment
- 5. theory well-tested concept that explains observations
- 6. effect caused by species producing offspring
- 8. remains or traces of an organism
- 9. effect caused by limited food
Down
- 1. helps an organism survive and reproduce
- 3. change in a species over time
- 7. any difference between individuals of same species