Evolutionary!

4. The measure of survival ability and ability to produce for offspring.
5. The idea that geologic processes that shape the earth remain constant over time.
8. A difference in a physical trait.
10. The process in which multiple species evolve in response to the changes in each other.
12. A feature that an organism develops to better survive in its environment.
15. A form of evolution between unrelated species, that result in similar characteristics, due to similar environmental conditions.
16. 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.
19. The physical movement of particular alleles from one population, to another.
20. The gradual biological process of change by which descendants begin to greatly differ from their ancestors.

1. The total number of genes of every individual in a population
2. The theory that natural disasters shaped the earth's landforms and caused extinction.
3. A preserved trace of an organism from the past.
6. The process by which humans select traits through breeding.
7. Producing more offspring than will likely survive.
9. A form of evolution between similarly related species, into more different species, due to differing environmental conditions.
11. Structure or organ that are similar structure, but different in purpose.
13. The ability for a trait to be passed down.
14. An observable change in the allele frequencies in a population.
17. The complete elimination of an entire species .
18. Study of embryos, used to find similarities between species during development.