Across
- 3. organisms struggle for food, water, shelter
- 5. to propose a hypothesis
- 8. preserved remains or traces of organisms
- 9. two species evolve in response to each other
- 10. close ___ can affect each other's evolution
- 12. fossil ____ all fossils ever discovered
- 14. complicated molecules important for cells
- 16. natural _____-better adapted individuals live
- 17. young organism developing from a fertilized egg
- 18. natural process by which something takes place
- 19. no longer exists
- 21. changing something unintentionally (at random)
- 23. one organism moves inside another's cells
Down
- 1. structures that look different/ similar use
- 2. an inherited trait that helps survival
- 4. proof, verification
- 6. Darwin's theory, change over time
- 7. how well an organism survives and reproduces
- 11. Gene ______ determines how a cell acts.
- 13. to move from one place to the next
- 15. a group of similar organisms
- 20. a well tested explanation.
- 22. sexual __organisms ability to get the best mate