Cómo ocurre el flujo de energía? “De la luz solar al ATP.”

culo si no me ayudas :c

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.

what school and grade?

the correct answer is 2 and 4