This is why they say little knowledge is dangerous.

a) In the double slit experiment, the act of measurement is the interaction that collapses the wave function

b) quantum entanglement I’m not well versed to comment on

c) energy is not destroyed, but we transform from one form to another and becomes less usable (workable) over time. That is because only low entropy energy is useful, the high entropy energy is just heat death (of the universe)