The fossil record documents changes in some types of animals in great detail, such as the change from small, curved shells to larger, flatter shells in O beetles O snails O oysters O turtles
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One of the finest available sequences of fossils shows how horses have changed slowly and by subtle steps from small, shrub-browsing ancestors to the large, grass-grazing modern horse. A large number of fossil species have been named, and it is often difficult to decide on the identity of a fossil horse because transitional forms are common. This record of evolution best fits the idea of gradual change over time.
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