Explanation: Surface runoff is water, from rain, snowmelt, or other sources, that flows over the land surface, and is a major component of the water cycle. Runoff that occurs on surfaces before reaching a channel is also called overland flow. A land area which produces runoff draining to a common point is called a watershed
I believe it is the lungs.
Im not sure if this is right or not but i think it might be C.
Hope its right!!!!
Is 24 because 48 divided by 2 is equal to 24