Which of the following is NOT an ion?
A. Mg+2
B. H+1
C. Br-
D. O2
E. NO3-
Answer: D
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What will be an ideal response?
During the _____ Period, southern Gondwana moved over the South Pole, resulting in extensive glaciation
A)Permian B)Carboniferous C)Devonian D)Ordovician E)Cambrian
If ocean water were incompressible, the sea level would be ________ its present level.
A. higher than B. lower than C. equal to
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