When sensory receptors change physical stimuli into signals that the brain can understand, this is called?

the cell theory states that all living things including animals, as well as plants, are made of cells.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

it's c. (to reduce the greenhouse effect/carbon gasses)

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