A closed system is one in which ______.

1.	A closed system is one in which ______.
A.	Mass does not cross boundaries of the system, though energy may do so
B.	Mass crosses the boundary but not the energy
C.	Neither mass nor energy crosses the boundaries of the system
D.	Both energy and mass cross the boundaries of the system
Answer» B. Mass crosses the boundary but not the energy

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A closed system is one in which ______.

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