Ch 15/16/17

1. / ability of organism to survive & reproduce
6. / change over time
8. / large-scale evolution
12. / form of reproductive isolation, species can't interbreed due to mountains etc.
14. / combined genetic info from all members of a population
15. / organ that serves no useful function
16. / scientist that studies fossils
18. / very small fossil
19. / preserved remains of ancient organisms

2. / formation of species
3. / principle that all living things derive from common ancestors
4. / trait controlled by one gene with two alleles
5. / tiny bubbles formed of big organic molecules w/ cell characteristics
7. / process individuals that are better fit survive & reproduce more successfully
9. / process of two species evolving in response to eachother's changes
10. / died out
11. / inherited characteristics that increase survival of organism
13. / trait controlled by 2+ genes
14. / random change in allele frequencies in small populations
17. / well-tested explanation that unifies many observations