Energy layers refer to the different levels of energy that exist within a system, such as in an atom or a molecule. In atomic physics, these layers are often described as electron shells, where electrons occupy specific energy levels around the nucleus. Each layer can hold a certain number of electrons, and the arrangement of these electrons determines the chemical properties of the element. In a broader context, energy layers can also apply to ecosystems, where different levels of energy flow through food chains. For example, producers like plants capture energy from the sun, while consumers like animals obtain energy by eating those plants. Understanding these layers helps explain how energy is transferred and utilized in various systems.