When energy is conserved or transferred, some energy becomes unavailable to do useful work. What happened to the unavailable energy?%0D%0AResponses%0D%0A%0D%0AIt is given off as heat.%0D%0AIt is given off as heat.%0D%0A%0D%0AIt is given off as microwaves.%0D%0AIt is given off as microwaves.%0D%0A%0D%0AIt is completely destroyed.%0D%0AIt is completely destroyed.%0D%0A%0D%0AIt is conducted.%0D%0AIt is conducted.