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During which period did the first land vertebrates appear? A. Devonian B. Mississippian C. Pennsylvanian D. Permian
The first land vertebrates appeared during the Permian period.
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Asked 1/18/2011 6:58:50 PM
Updated 7/28/2016 5:16:23 AM
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The first land vertebrates appeared during the Permian period.
Added 7/28/2016 5:16:23 AM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [7/28/2016 7:00:57 AM]
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Updated 12/29/2015 6:49:12 AM
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Added 12/29/2015 6:49:12 AM
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Which choice gives the center and radius of the circle represented by the equation? (x-3.5) squared + (y-2.4) squared = 8 A: (3.5, 2.4); 2 square root of 2 B: (3.5, 2.4); square root of 2 C: (3.5, 2.4); 2 D: (-3.5, -2.4); 2 square root of 2
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Updated 7/23/2014 3:00:14 AM
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The center and radius of the circle represented by the equation (x-3.5) squared + (y-2.4) squared = 8 is center (3.5, 2.4); radius = 2 square root of 2
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Earth's atmosphere has the lowest concentration of which of the following gases? A. oxygen B. nitrogen C. carbon dioxide D. argon
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Updated 3/29/2015 11:30:46 AM
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Added 3/29/2015 11:30:46 AM
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