Consider the ratio of oxygen 18 to oxygen 16 in the shells of organisms that lived in the sea during the geologic past. Which of the following describes the relationship between this ratio and the climate at that time?
A. the higher the ratio, the drier climate at that time
B. the higher the ratio, the wetter climate at that time
C. the higher the ratio, the colder climate at that time
D. the higher the ratio, the warmer climate at that time
Answer: C
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