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The ends of the geologic eras such as the Paleozoic and Mesozoic are marked by A. mass extinctions. B. index fossils. C. radioactive decay. D. climate changes.
Weegy: D. climate changes (More)
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Updated 7/27/2015 2:10:44 AM
1 Answer/Comment
The ends of the geologic eras such as the Paleozoic and Mesozoic are marked by Mass Extinctions.

Added 7/27/2015 2:10:42 AM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by Andrew. [7/27/2015 2:24:37 AM]
The first animals to live successfully on land were A. reptiles. B. flying reptiles. C. amphibians. D. arthropods.
Weegy: The first animals to live successfully on land were arthropods. (More)
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Updated 295 days ago|11/7/2015 5:56:56 AM
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Development of multicellular organisms probably began with the formation of A. bacteria. B. colonies. C. microspheres. D. oxygen.
Weegy: Development of multicellular organisms probably began with the formation of colonies. (More)
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Updated 344 days ago|9/19/2015 3:43:36 AM
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The geologic time scale is based on A. fossil evidence. B. radiometric dating. C. kinds of rocks. D. rock thickness.
Weegy: The geologic time scale is based on fossil evidence. (More)
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Updated 344 days ago|9/19/2015 3:45:02 AM
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What is the outside of the virus made of? A. RNA B. DNA C. lipids D. protein
Weegy: The outside of the virus is made of protein. (More)
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Updated 193 days ago|2/17/2016 11:46:16 AM
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