Unit 4 part B

3. similar physical features in organisms that share a common ancestor, but the features serve completely different functions
7. features of different species that are similar in function but not necessarily in structure
8. change over time
9. The process of selection conducted under human direction
12. A sequence of dna that codes for a particular trait
13. How reproductively successful an organism is
14. Change in DNA
16. When two populations are different in their periods of activity
17. The process by which new species are generated
19. The separation of a population so they can no longer mate with eachother
20. Biological evolution that occurs by chance
21. The separation of groups of organisms as a result of changes in their ecology

1. A physical incompatibility between reproductive organs of two organisms
2. The decline of gene flow between populations or species
4. Each population develops its own set of mutations
5. Structures that have no apparent function and appear to be residual parts from a past ancestor
6. Organisms evolve in wats that maximize their success in a given environment
10. A heritable trait that increases an individual’s fitness
11. the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers.
15. The process by which traits that improve an organism’s chance for survival and reproduction
18. When environmental conditions change rapidly or severely enough that a species cannot adapt to change