Choose the best answer to the following question. Explain your reasoning with on

Question

Choose the best answer to the following question. Explain your reasoning with one or more complete sentences. The concentration of carbon dioxide in Earth's atmosphere might be stated in which units? Choose the correct answer below. Joules per watt may be used because carbon dioxide is used in lightbulbs. Parts per million may be used because it gives the number of molecules of carbon dioxide in a million molecules of air. Joules per watt may be used because a unit divided by its corresponding rate gives concentration. Parts per million may be used because there are millions of carbon dioxide molecules in the atmosphere. Grams per meter may be used because when looking at a region of air with dimensions of 1 meter, grams describes the mass of material in that Grams per meter may be used because grams can describe the amount of carbon dioxide and meters can describes a height into the atmosphere.

Explanation / Answer

D. Because gas concentrations in air are usually given in units of parts per million especially components present in small amounts.

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