Can't answer 'cause you didn't provide an image of the passage.
Answer: Air and water <em><u>are</u></em> necessary for life.
Explanation:
Air and water are a plural subject because a subject made up of nouns joined by 'and' makes a compound subject, unless that subject's intended sense is singular, therefore the verb must be conjugated in the plural: "They are".
<h2><em>Eiztari</em></h2>
The student could show how each authors message about the theme is differ
