The image below represents the basic principle of as you move from the left of the diagram to the right of the diagram.
as the molecules are moving from high to low without assistance
Extracellular fluid
Lipid bilayer
(plasma
membrane)
Cytoplasm
Time
O Diffusion
Facilitated Diffusion
Active Transport

facilitated diffusion

Explanation:

because moves without atp energy required

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.