Question

Which is true according to the law of conservation of energy?
In a closed system, the total amount of energy in the universe keeps on changing.
The supply of energy is limited, so it is essential to conserve it.
In a closed system, energy can be created and destroyed.
In a closed system, energy cannot be used faster than it is created.
In a closed system, the total energy always remains constant.

Answer 1

In a closed system, energy can be created and destroyed.

Answer 2

No, actually, In a closed system, the total energy always remains constant.