Evolutionary!

2. Study of embryos, used to find similarities between species during development.
4. The idea that geologic processes that shape the earth remain constant over time.
6. The gradual biological process of change by which descendants begin to greatly differ from their ancestors.
7. The ability for a trait to be passed down.
11. A form of evolution between unrelated species, that result in similar characteristics, due to similar environmental conditions.
12. The physical movement of particular alleles from one population, to another.
13. The total number of genes of every individual in a population
14. 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.
16. The theory that natural disasters shaped the earth's landforms and caused extinction.
17. A difference in a physical trait.
18. A preserved trace of an organism from the past.

1. The process in which multiple species evolve in response to the changes in each other.
3. A form of evolution between similarly related species, into more different species, due to differing environmental conditions.
5. An observable change in the allele frequencies in a population.
6. The complete elimination of an entire species .
7. Structure or organ that are similar structure, but different in purpose.
8. The process by which humans select traits through breeding.
9. Producing more offspring than will likely survive.
10. The measure of survival ability and ability to produce for offspring.
15. A feature that an organism develops to better survive in its environment.