Environmental science apex question

Postindustrial.

Explanation:

It is not A, because they do not look like hunters (1), as they do not have any hunting equipment, and seem to be in a modern setting.

It is not B, because they are not farmers, and it does not look like they are in a agricultural setting.

It is not C, because it does not look like they are taming animals.

This leaves D as your answer.

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when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

that scientist would be robert hooke