When one oxygen atom shares two pairs of electrons with another oxygen atom, O2 is formed via a(n)
A. double covalent bond.
B. single covalent bond.
C. hydrogen bond.
D. ionic bond.
E. triple covalent bond.
Answer: A
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Presently, the replacement fertility rate in developed countries is ____
a. 2.0 b. 2.1 c. 2.4 d. 2.6 e. 2.8
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