Answer:
B. A system cannot take in additional matter.
Explanation: The total amount of energy in the universe remains constant, it can merely change from one form to another.
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C. cooked noodles and water
because noodles are long and water has no shape or size.
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If one of the variables is changed, that tells nothing about what happens to the other one, or IF anything happens, or when, or how long it lasts. Because they are UN-RELATED. You just said so yourself.
None of the choices says this.
The first two are always the reactants the products come after so they are last
Any object, except antimatter, :)