The word diet is introduced in the What Teens Need section of "Teens, Your Brain Needs Real Food" and is refined over the first three paragraphs. How does the author refine this word?

Description of the types of food

Explanation:

The author is trying to make the readers comprehend the types of food we have by describing them and expounding on how effective or good the types of foods are for the brain by their description.

newbie construction workers preparing to work at a job cite but are first going over safety concerns?

a dictionary is the correct answer