Why is a drop of food coloring in water a good model for the process of diffusion

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

1. list three scientific reasons cockroaches may fly.

Amixture with the same composition throughout is!