All terms in this list:

Organism: A living thing that can carry out life processes by itself.

Tissue: A group of similar cells that perform a common function.

Organ: A structure made up of a collection of tissues that carries out a specialized function.

Organ system: A group of organs that work together to perform body functions.

Structure: The arrangement of parts in an organism or an object.

Function: The activity of each part in an organism. The structure of any object determines this.