Answer:
the fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
Explanation:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the steps of a staircase.
Answer: tongue is a tough worker. It is made up of groups of muscles and like the heart it is always working. It helps in the mixing process of foods.
Explanation:
Repetition in writing can contribute to text because it can help to emphasize a point and gives words rhythm.
A subject and a verb and a complete thought that makes sense.
(Punctuation maybe)
