Which of the following statements concerning the first law of thermodynamics is/are true?
I) The internal energy of the universe is always increasing.
II) Internal energy lost by a system is always gained by surroundings.
III) The universe is an isolated system.
1. II and III only
2. III only
3. I and II only
4. II only
5. I and III only
6. I, II and III
7. I only
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