The snake is a consumer and a predator because it eats or consumes another organism (the mouse), but it is also prey because it is consumed or preyed upon by another predator (the hawk).
I think the answer to you r question is C. bc with no sunlight at the bottom the temp is affected. Also I looked up photosynthesis and it said that scientist have found this at the bottom of the ocean so it in fact does perform more photosynthesis What do you think?