The extinction of dinosaurs caused an end to the _______ between them and the mammals, thus allowing mammals to evolve to fill some ecological roles the dinosaurs had previously filled.
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Q45: Mammals evolved from a group of reptiles
Q49: Evidence that the Cretaceous mass extinction was
Q61: Using Uranium-235, a _ with a half-life
Q67: The oxygen necessary to support much of
Q67: Adaptive _ is the diversification of groups
Q69: The first single-celled organisms arose 3.5 _
Q72: Descendants of _ were among the first
Q75: Mammals evolved from _ about 220 million
Q79: Mammals branched out to evolve many new
Q80: Ninety-five percent of marine invertebrate species went
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