Can someone me with this question

in what direction do particles naturally diffuse?

question 8 options:

up concentration gradients

down concentration gradients

across concentration gradients

through concentration gradients

Down concentration gradients

Explanation:

Without input of any energy, particles naturally move from high concentration areas to low concentration areas through diffusion. This happens until they are equally distributed in that space. They are therefore said to move down their concentration gradient.

the match lol

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs