Cuvier,a French scientist,noted that the older the strata,the more dissimilar the fossils in it were,compared to current life forms.He also observed the appearance and disappearance of species.Cuvier proposed that the differences among fossils and species extinctions were a result of
A) evolution.
B) catastrophic events.
C) competition between species.
D) the origin of new species.
E) natural selection.
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