Across
- 4. more offspring are born than could possibly survive
- 8. organisms that can reproduce with one another and produce fertile offspring
- 9. father of evolutionary theory
- 10. obtains food by feeding on other organisms (ex. animals)
- 13. preserved remains of ancient organisms
- 14. selection, process where organisms with the best genetic adaptations will survive and reproduce
- 18. level, each level in a food chain
- 19. process which separates individuals of a species by a physical barrier
- 20. organs, physical structures that were fully developed in earlier organisms but are now unused
- 21. consumers, organisms that eat primary consumers for energy
Down
- 1. widely accepted statement based on scientific evidence that helps explain a group of facts
- 2. one species resembles or sounds like another species to gain an advantage
- 3. the study of interactions of living things with each other and their physical environment
- 5. factors, all the nonliving factors (may be limiting factors)
- 6. breaks down organic material of remains of dead organisms (ex. bacteria, earthworms)
- 7. consumers, herbivores that feed on plants
- 11. selection, where humans choose and control desirable traits for organisms (ex. dog breeds)
- 12. factors, all the living things that affect the environment
- 15. factor, anything that limits a population's size or slows its growth
- 16. capacity, species average population size
- 17. use energy from the sun to create their own energy (ex. plants)
- 21. ultimate source of energy for Earth