The modern oceans are a major repository for the greenhouse gas______ , which some organisms utilize to make their shells. A) iron oxide B) ammonia C) SiO₂ D) CO₂ E) limestone

Question

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The only gas mentioned in the options that is a greenhouse gas and utilized by organisms to make their shells is CO₂ (also known as carbonyl sulfide). This gas is converted into sulfur compounds which some marine organisms use to form their shells. The other options (iron oxide, ammonia, SiO₂, and limestone) are not greenhouse gases utilized by organisms to make their shells.

The Modern Oceans Are a Major Repository for the Greenhouse