A highly contagious viral infection that causes symptoms like fever, cough, and a characteristic red, blotchy rash.

A natural body passage or opening, such as the ear canal or the urethra.

The physical breakdown of food into smaller particles, typically involving chewing and churning in the stomach.

The middle value in a set of data when arranged in numerical order.

A type of vegetation found in Mediterranean climates, characterized by drought-resistant shrubs and herbs.

The innermost part of an organ, such as the brain or kidney, involved in various physiological functions.

A part of the brainstem that regulates vital functions such as breathing, heart rate, and blood pressure.

A free-swimming form of cnidarians, such as jellyfish, characterized by a bell-shaped body and tentacles.

Events in Earth’s history when large numbers of species went extinct over a relatively short period of time.

The total number of protons and neutrons in the nucleus of an atom.