2) At one point, Tigo says, "...But I want you to know I don't know you from a hole in the wall--except you wear a blue and gold jacket." What does he mean
by this? Why do you think he says this?

"I don't know you from a hole in the wall" is like when you don't know who someone is just by looking at them

Explanation:

It basically means he remembered the person from their jacket, not from how they look. I think he said this because he wanted the person to know that even though they might've been friends for a while or worked together, he wouldn't even recognise them if he saw them wearing a different outfit. He was able to identify the person by their jacket.

That's my opinion:)!

your answer is c) experiments with water vapor showed that elements combine in specific proportions.