Which of the following accurately describes ^18 O / ^16 O ratios of the oceans?

Question

Which of the following accurately describes ^18 O / ^16 O ratios of the oceans? Because ^18O evaporates more readily than ^16O. the oceans have a higher relative abundance of ^16O during the summer. The ^18O/^16O ratio in the ocean is low during the winter because temperatures are too low for ^16O to evaporate During the winter. ^16O is high in the ocean; during warmer periods the isotope ratio is lower The ratio of oceanic ^18O/^16O in the late summer is high, because the most of the ^16O has evaporated by then.

Explanation / Answer

Ans:  

       The higher the ratio of 18O to 16O in the shells of organisms that lived in the ocean during the geologic past, the colder the climate at that time.

18O evaporates more readily than 16O , the oceans have higher relative abundance of 16O during summer

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