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in populations, to change genetically over generations to become more suited to the environment
an inherited trait that increases an organism's chance of survival in a particular environment
an evolutionary pattern in which many species evolve from a single ancestral species
in evolution, structures in more than one organism that have similar appearance and function but different embryological origins
the process by which unrelated species become more similar as they adapt to the same kind of environment
a measurement of the ability of a species to respond to the pressures of natural selection; the ability of individuals to survive to propagate their genes
law of superposition
a law that states that successive layers of rock or soil were deposited on top of one another and the lowest level is oldest
a type of fossil formed from an impression of the shape or tracks of an organism; in fungi, a mass of tangled filaments of cells, such as the fungus that grows on bread
the process by which organisms with favorable variations reproduce at higher rates than those without such variations
a principle that states that the geological structure of Earth resulted from cycles of observable processes and that these processes operate continuously
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