Question

Which statement best describes why the universe could be considered an isolated system?

A. All matter that enters the universe remains contained within the universe
B. energy and matter are created in the universe; when new energy is created, old energy exits
C. in the universe,all energy and matter are contained; no energy or matter enters or exits.
D. the universe is a contained system where no energy exits

Answer 1

Answer: The answer is C

Explanation: The universe is considered an isolated system because the energy of the universe is constant. This matches with the definition of an isolated system, which is that energy is not exchanged with the surroundings, thus staying constant.