Mammal Numbers, Diversity, and Size Increased Dramatically at the End

question 218

Multiple Choice

Mammal numbers, diversity, and size increased dramatically at the end of the Cretaceous because

• A) non-avian dinosaurs became extinct at that time.
• B) mammals evolved differentiated teeth that allowed them to outcompete non-avian dinosaurs.
• C) mammals were a group of theropods similar to the group that led to modern birds.
• D) mammals were viviparous, leading to greater reproductive success than in the dinosaurs.
• E) mammals evolved hollow bones, allowing them to escape from predatory dinosaurs.

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