Which essential gas is often in an unusable form in the ocean and atmosphere?
a. Nitrogen
b. Oxygen
c. Carbon dioxide
d. Methane
ANS: A
Nitrogen gas is saturates in the upper layers of the ocean. Although organisms need nitrogen to build
proteins, most nitrogen cannot be used. The nitrogen needs to be bound or fixed in order to be used by
organisms. Information can be found in the section Gases Dissolve in Seawater
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What will be an ideal response?
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