Evolution

2. Evolution occuring on a small scale affecting a single population
8. Differences in the physical traits of organisms
10. A group of organisms that can successfully interbreed and produce viable, fertile offspring
11. Elimination of a species
13. A feature that allows an organism to better survive in its environment
15. English naturalist who went on a voyage to the Galapagos Islands and noticed that different species of animals that lived on different islands had specific characteristics for that island
16. Evolution occuring on a large scale affecting changes in species across populations
17. When unrelated species evolve similar characteristics because they live in similar environments, it is know as __________ evolution
18. Occurs when two populations of organisms form a specialized relationship and thus change in response to each other
19. A measure of how well you can survive in your environment
20. The combined alleles of all individuals in a population
21. Individuals do not evolve, __________ do!

1. organisms with the "best" traits (adaptations) will live longer and reproduce more than others, causing changes in the population over time by acting on traits that are heritable
3. Bursts of change followed by periods of stability is known as punctuated __________
4. A type of divergent evolution occurring on a small scale over a shorter period of time is known as adaptive __________
5. The ultimate source of variation
6. Forming of a new species by evolution from a pre-existing species
7. Lots of offspring and limited resources causes competition is known as __________ of offspring
9. A number of different species arising from one common ancestor is known as __________ evolution
12. A change in gene frequency over time where beneficial traits are becoming more common is known as descent with __________
14. Slow, constant changes over a long period of time