Evolution

2. having the same relative position, value, or structure
5. the changes in the proportions of biological types in a population over time
8. how a new kind of plant or animal species is created
10. of the fittest- the continued existence of animals which are best suited to their environment; a concept of Darwin's theory
11. effect- a genetic drift in which a small number of individuals from a large population emigrate to a new area
13. mechanism by which organisms adjust to new environments or change in current environment.
15. two organisms evolve in response to each other
18. flow- exchange of genes among populations through interbreeding

1. structures that have no apparent function and appear to be residual parts from a past ancestor
3. simple cells that do not have a true nucleus or organelles
4. effect- a sharp lowering of a population's gene pool because of an environment, or human-caused, change
6. reproduction- the offspring inherit the full set of genes from a single parent
7. populations become more dissimilar to adapt to the environment
9. selection- process in which better adapted organisms survive and reproduce
10. reproduction- production of new organisms by combining genetic information from a male and a female
11. evidence- evidence of the evolution of plants and animals and their extinction
12. similarity of function and superficial resemblance of structures that have different origins
14. any cell or organism that has a clearly defined nucleus
16. the dying out of a species
17. unrelated organisms evolve structures, traits, or morphological features that have the same function