Atoms - The smallest parts of elements that still retain all the original properties, combine to form a molecule.
Molecule - A chemical bonding of atoms that possesses its own characteristics indepent of the atoms themselves. Specific molecules combine to form cells.
Cells - the basic unit of all life. Cells combine in terms of function and type to form tissues.
Organs - Two or more tissue types work together to perform a specific function.
Organs work together to perform a task the result is an organ system.
The organism is the result of all organ systems working together within the body.