<span>The best place would be far away from a cliff and the worst would be right on top of a cliff or some sort of land such as a beach or directly beneath it. At anytime, gravity will cause mass wasting, in other words the rock and soil will just break apart.</span>
I am pretty sure it's D) use of electrons focused by magnetic fields.
The random movement of molecules across a concentration gradient until the difference in concentration between two regions is near zero.
Im thinking it's active transport :) hope it helps.
What animals are there to choose from?