| A | B |
|---|
| domain | taxonomic category. The three are Archaea, Bacteria, and Eukarya. Brown bears are part of Eukarya. |
| species | taxonomic category. Brown bears are part of arctos. Unlimited reproduction. Along with genus, this makes the scientific name Ursus arctos. |
| survival of the fittest | natural process resulting in the evolution of organisms best adapted to the environment. |
| Darwin | English natural scientist who formulated a theory of evolution by natural selection (1809-1882) |
| Lemark | suggested that life evolves or changes over time due to adaptations. |
| mutation | random error in gene replication that leads to a change |
| competition | relationship in which the struggle between organisms to survive in a habitat with limited resources |
| predator-prey | relationship in which one organism eats another |
| limiting factor | factor that causes the growth of a population to decrease |
| Theory of Evolution | states that evolutionary change comes through the production of variation in each generation and differential survival of individuals with different combinations of these variable characters. |
| genetic variation | Differences among individuals in the composition of their genes or other DNA segments |
| Over production | species produce more offspring than possibly can survive. |
| vestigial structures | remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species. |
| analogous structures | Body parts that share a common function, but not structure (like a bat wing and bird wing) |
| homologous structures | similar structures that related species have inherited from a common ancestor |
| Embryology | Study of embryos and their development |
