Diffusion is the movement of a substance
a. only through the lipid bilayer.
b. only in liquids.
c. only in air.
d. from an area of high concentration to an area of low concentration.

d. from an area of high concentration to an area of low concentration.

Just took the test

11 players on a field that has a maximum of 11 players

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.