Across
- 3. differences among individuals in a population.
- 5. a group of related organisms able to reproduce.
- 9. structures of similar logic
- 10. Who proposed the theory of evolution by natural selection
- 11. ability of a trait to be passed to the next generation.
- 12. a characteristic change that helps an organism survive
- 15. when organisms disappear from the earth
- 16. Survival of the _____, where an organism's behavior and form help it survive.
- 17. change over time
Down
- 1. the study of the earth
- 2. adaptive ______ is when one species evolves into many.
- 4. structures that have no current function
- 6. formation of new species
- 7. preserved remains of ancient organisms.
- 8. principle stating that all living species contain changes from their parents; descent with _______.
- 13. Natural ______ is the process by which evolution occurs.
- 14. refers to the variety of living things