Final answer:
In a closed system, matter is conserved, and energy can transfer in and out.
Explanation:
The two correct generalizations based on cycles of matter in a closed system are:
- The amount of matter within the system remains the same: This is in line with the law of conservation of matter, stating that matter cannot be created or destroyed in a closed system.
- Matter and energy can cross the boundaries of the system: While matter remains constant, energy can flow in and out of the system.
Therefore, in a closed system, matter is conserved, and energy can transfer in and out.
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