Biology Evolution

2. walking on two feet
4. ability to live long enough to reproduce successfully
9. selection that leans towards one extreme of the trait
11. selection that chooses the extremes of the trait
13. the fluctuations of frequencies in a population's genotype
15. a primate of a family that includes humans, their fossil ancestors, and some great apes
17. an organism's role in the ecosystem
18. type of structures that have different bones but same function
19. when similar organisms can be found on different continents
21. type of structures that have same bones but different function
22. a change in structure or genetic makeup

1. organisms so closely related they can interbreed fertile offspring
3. type of evolution where organisms of the same species evolve into two separate species
5. the process whereby organisms better adapted to their environment tend to survive and produce more offspring
6. the effect of a once large population becoming very small with little genetic variation
7. selection that chooses the average of the trait
8. structures that are no longer needed but ancestors did need them
10. a change or the process of change by which an organism or species becomes better suited to its environment.
12. the study of similarities and differences in embryonic development
14. type of evolution where two different organisms evolve together
16. the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth
20. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock