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Niles Eldredge and Stephen Jay Gould researched the lenses of the eyes of fossil trilobites of different species. In 1972 they published a paper in which they described the tendency of a species to remain the same until a sudden change in the environment causes a new related species to appear. Which hypothesis was most challenged by the work of Eldredge and Gould?

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Darwin's hypothesis that the development of species is a slow, gradual process.

User Pierre Fourgeaud
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