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The naturalist that came up with the theory of natural selection. Principle that states that an organism must be able to survive and reproduce in their environment. CHARLES DARWIN ADAPTATION Principle that states that differences in an organism’s phenotype drive natural selection. VARIATION Principle that states that not all offspring may survive, only the most fit to survive will. A term that measures the ability of an organism to survive and reproduce. FITNESS This theory describes how species change over time. OVERPRODUCTION EVOLUTION Principle that states that traits that are beneficial are passed down from ancestors to future generations. SELECTION Darwin observed variations in the finches beaks. Why were they varied? Adaptions to their individual environments and food sources. Without this, evolution would not happen! Other than food, what are other resources that species must compete for in the wild? VARIATIONS IN SPECIES Water, shelter, space, light This describes when nature determines what will have a higher or lower fitness level. This type of anatomy shows similar function, but not necessarily a similar structure. NATURAL SELECTION ANALOGOUS ( can’t use as evidence of common ancestor) This type of anatomy shows similar bone structure, but not necessarily a similar function. This type of anatomy shows remnants of structure that used to have a function, but no longer do. HOMOLOGOUS VESTIGIAL Two animals that have almost identical DNA strands most likely: WILD CARD! YOU Create the question! Have a common ancestor