The amount of matter within the system remains the same.
The cycle has a well-defined starting and stopping point.
Explanation:
A closed system can be defined as a system in which there is the only exchange of energy with the surrounding, while no exchange of matter takes place.
In a closed system, the cycle has a well-defined starting and stopping point.
Therefore, the two generalizations which can be made for cycles of matter in a closed system are option 3 and 5)
