Answer:natural active immunity
Explanation:lol it took too long
The answer is it's combination of alleles for a specific one.
C. The small rocks are mechanically weathering the larger rocks and erosion is morning the pieces downstream
There is no chemical change in this so it has to be mechanically. Than erosion is causing the rocks to be moving the pieces downstream. Deposition means another thing...
The order is D, C, A, then B