A diagram of the digestive system is shown below.

What is the main function of the digestive system?
A.
to break down food into nutrients that can be circulated throughout the body
B.
to exchange oxygen and carbon dioxide gases within the body
C.
to send signals from one part of the body to other parts of the body
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A. To break down food into nutrients that can be circulated around the body. :)

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.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

hope this !