Evolution

2. Differences between cells, individual organisms, or groups of organisms caused by genetic differences (genotypic) or by the effect of environmental factors(phenotypic)
4. The sort of evolution where species independently evolve similar traits as a result of having to adapt to similar environments.
8. A stressor present in an environment that places pressure on certain organism's survival.
10. The formation of new and distinct species in the course of evolution.
11. A trait that allows an organism to survive in a specific environment.
12. The organism that is the best adapted to the environment.

1. The change in the heritable characteristics of biological populations over successive generations.
3. The transfer of alleles or genes from one population to another.
5. The process whereby organisms better adapted to their environment tend to survive and produce more offspring.
6. The process in meiosis where sections of DNA move between homologous chromosomes to create recombination and genetic variation.
7. The change in the frequency of a gene variant (allele) in a population due to random sampling of organisms.
9. A change is the DNA sequence of an organism that may result in a phenotypic change.