Why would physical science be used to study light emitted by a star?
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a. light is very pretty.
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b. light is a form of energy.
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c. stars form interesting shapes in the sky.
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d. the positions of stars control our lives.

B the positions of stars control our  lives

Explanation:

c.is a substance that requires a small amount of energy per gram to raise its temperature; has strong cohesive forces between molecules.

explanation:

a colorless, transparent, odorless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

i would think it's food chain