Evolutionary!

3. The measure of survival ability and ability to produce for offspring.
6. Structure or organ that are similar structure, but different in purpose.
8. The process by which humans select traits through breeding.
10. The complete elimination of an entire species .
11. A natural mechanism by which a species, or member of that species inherits a beneficial adaptation that allows it to produce more offspring than others.
13. The gradual biological process of change by which descendants begin to greatly differ from their ancestors.
15. Producing more offspring than will likely survive.
16. The idea that geologic processes that shape the earth remain constant over time.
17. A form of evolution between similarly related species, into more different species, due to differing environmental conditions.
20. The theory that natural disasters shaped the earth's landforms and caused extinction.

1. A feature that an organism develops to better survive in its environment.
2. A difference in a physical trait.
4. The ability for a trait to be passed down.
5. A form of evolution between unrelated species, that result in similar characteristics, due to similar environmental conditions.
7. A preserved trace of an organism from the past.
9. An observable change in the allele frequencies in a population.
12. The process in which multiple species evolve in response to the changes in each other.
14. The total number of genes of every individual in a population
18. The physical movement of particular alleles from one population, to another.
19. Study of embryos, used to find similarities between species during development.