Across
- 4. the ability to survive and reproduce
- 6. have no function but might have in the past
- 9. a change in DNA
- 10. a change in frequency of alleles
- 11. movement of a population, group, or individual
- 13. humans develop these traits
Down
- 1. similar in function but not structure
- 2. physical changes in an organism
- 3. beneficial traits sparks survival
- 5. resemblance between organisms
- 7. species developing over time
- 8. becoming more suited to an environmnent
- 12. disguises an organism