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andriy [413]
3 years ago
7

Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.

Biology
1 answer:
evablogger [386]3 years ago
5 0

Answer:

<em>The correct option is A) they are all classified as pure substances.</em>

Explanation:

Pure air is a term which is used to described air which is free from pollutants or other contaminants. All the substance from which air is made are considered as pure substances. Hence, option A is correct.

Other options, like option C, is false because the components of the air are no chemically bonded to one another. They exist freely. Options D is false because not all the components of air can be classified as an element. For example, carbon dioxide is not an element.

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