A biome is a large naturally occurring community of flora (plants) and fauna (animals) occupying a major habitat (home or environment).

An element is matter than cannot be separated into different types of matter by ordinary chemical methods.

In contrast to the solid terrestrial planets, the outer planets (Jupiter, Saturn, Uranus, and Neptune) consist of hydrogen and helium gas and water.

A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.

The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.