Which of the following statements characterizes oxygen 16 and oxygen 18?
A. Oxygen 16 and oxygen 18 evaporate from ocean water at the same rate.
B. Oxygen 18 contains two more electrons than oxygen 16.
C. Oxygen 16 and oxygen 18 exist in the shells of marine organisms.
D. Oxygen 16 and oxygen 18 occur in roughly equal amounts in ocean water.
Answer: C
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