fossil - the remains of an organism, evolution - a change in the allele frequencies in a population over time, cladogram - a diagram that shows relationships between organisms, common ancestor - the organism that came before two or more organisms (descendents), population - a group of the same organism in a given area, Charles Darwin - a naturalist who contributed to the theory of evolution, relative dating - to determine the age of a fossil based on the rock layer it's found in, stasis - an organism that shows no change over time, sudden appearance - when an organism appears in the fossil record fully formed, molecular evidence - DNA and proteins that related organisms share,

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