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Gradual evolution must show records of fossil that underwent small incremental changes within the species. In this type of evolution, there are intermediate or transitional forms of fossils that show small variations.
On the other hand, records of fossil that seem to lack intermediate forms between species are likely the result of rapid evolution. This type of evolution occurs after a major ecological change wherein new environmental conditions arise. Due to the new conditions, only small isolated populations that possess great variation in morphology are able to survive and reproduce. As a result, the population evolves into new species.
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