What marks the boundary between the Mesozoic and the Cenozoic (called the K-T boundary)?
a. the extinction of the dinosaurs
b. the start of a rise to dominance of mammals
c. a meteorite impact in Mexico
d. all of these
e. none of these
The answer is A. the extinction of the dinosaurs. [ The boundary marks the end of the Mesozoic era and the beginning of the Cenozoic era, and is associated with the Cretaceous–Paleogene extinction event, a mass extinction, which is considered to be the demise of the non-avian dinosaurs. ]
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Asked 10/1/2012 2:20:16 PM
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