Across
- 9. survival of the fittest
- 11. selective breeding for desired traits
- 13. geographic distribution of species
- 14. mutation that causes different colored eyes
- 16. important for diversity (even among siblings)
- 17. change in genetic sequence
- 18. similar organisms that produce offspring
- 19. bones that have been preserved and fossilized
- 20. birds studied by Darwin in the Galapagos Islands
Down
- 1. structures that are similar in different species
- 2. boat darwin sailed on
- 3. no longer living
- 4. creating of new species
- 5. small sequences in DNA
- 6. came up with the idea of natural selection
- 7. an organism in its earliest stages of development
- 8. structure that is present but no longer needed
- 10. study of body structure
- 12. humans have 23 pairs of ________
- 15. factors like radiation and _______ can cause mutations