All terms in this list:

Organism: An individual living thing, made up of one or more cells that is capable of growing and reproducing.

Cell: The smallest unit that is able to perform the basic functions of life.

Tissue: A group of similar cells that are organized to do a specific job.

Organ: A structure in a plant or animal that is made up of different tissues working together to perform a particular function.

Organ System: A group of organs that together perform a function that helps the body meet its needs for energy and materials

Unicellular: Term used to describe an organism that is made up of a single cell

Multicellular: Term used to describe an organism that is made up of many cells.

Microscope: An instrument that uses glass lenses to magnify an object.

Kingdom: Five main groups that scientists have divided the world of living things into.