The molecules in the image below are able to move across the cell membrane through channels in the membrane proteins. The cell does not use
any energy to move the molecules down the concentration gradient. What
kind of transport is the cell using?

A

Explanation:

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.