Evolution and natural science

4. Physical separation of populations of organisms from one another due to geographical barriers.
6. How reproductively successful an organism is in its environment.
8. The preserved remains of organisms whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers.
9. Biological evolution that occurs by chance.
12. Only those individuals most adapted to their environment survive, in dangerous circumstances.
14. When species are reproductively isolated from others due to differences in behavior.
15. The disappearance of a species from Earth.
19. A physical incompatibility between reproductive organs of two organisms.
20. A heritable trait that increases an individuals fitness is called an adaptation.
21. The retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species.

1. Features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature.
2. A process of selection conducted under human direction.
3. Changes in DNA.
5. The process by which new species are generated.
7. The process by which traits that improve an organisms chances fro survival and reproduction are passed on more frequently to future generations than those that do not.
10. Genetic divergence is the process in which two or more populations of an ancestral species accumulate independent genetic changes (mutations) through time
11. Similar physical features in organisms that share a common ancestor, but the features serve completely different functions.
13. A sequence of DNA that codes for a particular trait
16. When two or more species reproduce at different times.
17. A form of reproductive isolation, wherein habitat preferences of species lowers the probability of mating.
18. change over time