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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)
Question
Updated 196 days ago|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 196 days ago|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 93 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 142 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 142 days ago|9/19/2015 3:45:02 AM
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Which of the following was NOT true about the "Safety Valve Theory?" A. it supported the Homestead Act of 1862 B. it released pressure in competition for employment in the big cities C. many people left the cities and moved West in support of it D. it was used to promote settlement in the West
Weegy: B (More)
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Updated 2/13/2013 6:51:23 AM
1 Answer/Comment
That it supported the Homestead Act of 1862 NOT true about the "Safety Valve Theory. - -
Added 2/13/2013 6:51:23 AM
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