Evolution, How an organism changes over time by the forces of environmentand genetics, Homologous Structures, Structures derived from a common ancestor that evolved, Vestigial Structures, Structures that once had a purpose but no longer do, Superposition, Using the sequential position of layers to date organisms, Comparative Anatomy, A side by side of body structures, Comparative Embryology, A side by side of early stages of develoment, Charles Darwin, A naturalist famous for his theory of Natural Selection, "On the Origin of Species", Book written by Charles Darwin, Galapagos Islands, Island visited by C.D. , Fossils, The remains of animals preserved in rock, Overproduction, A fish that has millions of eggs , Competition, Two birds fighting for the same tree, Speciation, Two organisms which can not mate anymore, Reproduction, Passing on their traits, Camouflage, How animals use their color to hide.

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