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OpenStudy (anonymous):

Which era in earth's history is often referred to as the age of mammals? A. Paleozoic B. Cenozoic C. Mesozoic D. Precambrian

OpenStudy (anonymous):

B. Cenozoic

OpenStudy (anonymous):

Which sentence best describes the information provided by radiometric dating? A. Age is relative to other rocks in the area. B. Age is based on radioactive materials that are in the rock. C. Age is based on the type of rock. D. Age is based on fossils that are found in the rock.

OpenStudy (anonymous):

D new post

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