* Radiation Zone: This layer is where energy is transported outwards by photons. Smaller stars have less pressure and temperature, making radiative transport less efficient.

* Convection Zone: This layer is where energy is transported by the movement of hot gas. Smaller stars have a less powerful convection zone due to lower energy output.

* Photosphere: This is the visible surface of a star. Smaller stars have a cooler, less luminous photosphere.

In essence, smaller stars have a simpler internal structure with fewer distinct layers. They primarily consist of a core where nuclear fusion occurs, surrounded by a layer of plasma.

It's important to note that smaller stars still have all the fundamental components of a star: core, radiative zone, convection zone, and photosphere. However, the size and prominence of these layers vary significantly based on the star's mass and luminosity.