Which compound is a saturated hydrocarbon?

Saturated hydrocarbons are organic compounds that contain only single bonds between the carbon atoms. They are known to be the simplest organic compounds. They are termed as such because they are saturated with water. Examples are the alkanes (ethane, methane, propane, butane, etc.).

12 is probably the typical age for a first kiss but i think its to young.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.