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View submission: Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
Its more accurate to say that newer models in physics cover a greater range of energies, both high and low. For instance, QM is necessary to explain a ton of things that happen as you approach absolute zero, like Bose-Einstein condensates.
As for your second question, a key part of any new theory is that it can reduce to an old theory in cases where the old theory's predictions are accurate. For instance, general relativity reduces to special relativity when dealing with flat, Minkowski spacetime, and special relativity reduces to classical mechanics for speeds much less than the speed of light.
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