Across
- 4. causes variation at the genetic level
- 7. Darwin's theory of how changes occur in organisms over time
- 9. long periods of time with no change followed by rapid change
- 10. evolution where multiple species come from a common ancestor
- 11. useless parts
- 13. appearance of new species after mass extinction
- 15. same structure different function
- 16. type of mutation that has no affect on the survivability of the organism
Down
- 1. when organisms select mates with desirable traits
- 2. development of new species due to reproductive isolation
- 3. evolution happens slowly over time
- 5. farmers practice ________ selection to improve their livestock or crops
- 6. the evolution of similar adaptations in two different species
- 8. random loss of variation in small populations
- 12. same function but built differently
- 14. gives direct evidence that species change over time