Across
- 2. proof of the existence of something that was once here but isn't anymore
- 5. change in frequency of genes in a population
- 7. the study of very early forms of organisms (embryos)
- 8. process of a species changing over time
- 9. the ability to survive and reproduce in your environment
- 10. selects for traits that improve mating success
- 12. pre-______ is before mating occurs
- 15. permanent disappearance of a species from earth
- 16. the crossing of 2 different species
- 17. populations become isolated when there is no gene flow
Down
- 1. organisms struggle for limited resources
- 3. the movement of alleles between populations
- 4. traits being naturally selected to help a species better survitsn their environment
- 5. total number of genes on a particular population or species
- 6. current distribution of species around the earth
- 11. ______ isolation occurs in the SAME area
- 13. a random change in the DNA of a gene
- 14. ______ organs: organs in an animal that are now just traces of what they once were (ex. whale with a femur)
- 17. ______ isolation occurs in DIFFERENT areas