The energy for muscle contraction is most directly obtained from

it is obtained from Adenosine triphosphate(ATP).

Explanation:

In muscle metabolism, muscle need energy for contraction. This energy is obtained from the Adenosine triphosphate (ATP) present in the muscle. The muscle contain limited quantities of ATP. When it is depleted, ATP need to be resynthesize from other available sources like creation phosphate and muscle glycogen.

Metabolism is the total activities which take place in the body to create energy and other substances for its activities.

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.

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