Unit 7: Natural Selection

3. The study of embryonic development of organisms.
4. Evolution on a much larger scale affecting changes in species across several populations
5. a species can evolve to resemble another
9. A Burst of changes followed by periods of stability
12. Slow changes over a long period of time
13. The theory that some organisms will survive and reproduce better than others.
16. the random change in frequency of an existing
17. The study of prehistoriclife.
18. Same structure, different function resulting in a common ancestor
20. variant in the population due to random chance
21. remnants of animals (bones, footprints,feces, etc)
22. A number of different species arise from a common ancestor

1. a feature that allows an organism to better survive in its environment
2. Two organisms change in response to each other forming a specialized relationship
6. differences in the physical traits of organisms
7. structures with little or no function to the organism.
8. Evolution on a much smaller scale affecting only a single population.
10. adaptations that allow species to blend in with an environment
11. movement of genes into/out of a population.
14. When unrelated species evolve similar characteristics because they live in similar environment.
15. the combined alleles of all individuals in a population.
19. Evolved similar structures due to living in similar environments, not due to ancestral relatedness