What Marks the Boundary Between the Mesozoic and the Cenozoic

question 90

Multiple Choice

What marks the boundary between the Mesozoic and the Cenozoic called the K-P 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

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Ignoring Potential

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