Question

Capitalization
English XI - Skills
Choose the sentence that is capitalized and punctuated correctly.
As carbon dioxide accumulates in the Atmosphere, the greenhouse effect will occur.
As carbon dioxide accumulates in the atmosphere, the greenhouse effect will occur.
As Carbon dioxide accumulates in the atmosphere, the greenhouse effect will occur.
As Carbon Dioxide accumulates in the atmosphere, the greenhouse effect will occur.​

Answer 1

Answer: As carbon dioxide accumulates in the atmosphere, the greenhouse effect will occur.

Explanation:

Carbon dioxide is a not a proper noun and so it is not to be capitalized in sentences rather the Carbon can be capitalized if it is at the beginning of the sentence.

The atmosphere as well is not to be capitalized in sentences because it is a common noun which is used to describe general things like the atmosphere. Common nouns are not to be capitalized within sentences.