Which is not a way that ATP is used for mechanical work? Movement at the cellular level.
Muscle contractions
Movement of the flagellum
Joining monomers to form a polymer

Joining monomers to form a polymer

Explanation: because monomers and polymers are what make up a fiber whereas ATP ( Adenosine triphosphate) is the energy currency of a cell.

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.

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.