Which two generalizations can be made based on what you know about cycles of matter in a closed system? 1 new matter is added, and old matter is destroyed. 2 matter changes its physical form, allowing it to return to its original state. 3 the amount of matter within the system remains the same. 4 matter and energy can cross the boundaries of the system. 5 the cycle has a well-defined starting and stopping point.

The correct answer is option 3) The amount of matter within the system remains the same and 5) The cycle has a well-defined starting and stopping point.

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 1) and 5)

The statements 3 and 5 can be two generalization made by the information of a closed system.

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