scientific theory - well tested concept that explains a wide range of observations, natural selection - a scientific theory often referred to as “survival of the fittest” where genetic change is influenced by environment, evolution - the gradual change of a species over time, variation - any difference between individuals of the same species, adaptation - a physical characteristic or behavior that increases the ability of an organism to survive and reproduce, population - a group of organisms in a particular area that are all of one species, species - a group of organisms that are genetically similar and can mate to produce offspring that can also reproduce, Morphology - the branch of biology that deals with the form of living organisms, and with relationships between their structures, Homologous structures - structures of different species that have the same physical origin but do not necessarily perform the same function, cladogram - a branching tree diagram that displays organisms and their common ancestors, common ancestor - a past species of organism that has genetic links to current species,

Evolution: Change Over Time SNB p. 75

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