Across
- 2. ability of an individual to survive and reproduce
- 4. process organisms have descended from organisms
- 6. different mature forms develop from embryonic tissues
- 7. resemble legs, tails, or other structures
- 8. common ancestors of all living things
- 10. preserved remains of ancient organisms
Down
- 1. living species has descended from other species over time
- 3. survival of the fittest
- 5. inherited characteristic that increases survival
- 9. supported testable explanation