A streak is <span>a long, thin line or mark of a different substance or color from its surroundings.</span>
C. Not all mixtures have solutes and solvents
Energy levels inside an atom are the specific energies that electrons can have when energy occupies specific orbitals. Electrons can be excited to higher energy levels by absorbing energy from the surroundings, an equivalent light is emitted when an electron returns from a high energy state to a lower one. Representation of this diagrammatic is known as the energy level diagram.
