A single celled organism that carries out all life processes.

All living organisms are made up of cells, cells are the basic units of structure and function in living organisms, and new cells are made from existing cells.

An organism made up of many cells.

The theory that microbes can cause infectious diseases.

A small compartment in the center of the cell which contains the majority of the genetic information and directs the cells’ activities. The “brain” of the cell!

A microscopic cellular organism or a virus.

The area visible through an optical instrument, such as a microscope.

Cell structures, often surrounded by a separate membrane, that perform a specific function.

The process in which oxygen is used to break down sugar from food and carbon dioxide released as waste.