Which of the following provides the best example of the parts of a system working together to achieve a specific function?

Glands in the mouth, the stomach, the pancreas, and the small intestine secrete chemicals that break down nutrients.

Explanation:

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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.

d we did this already