Level of Organization
cells
tissue
organs
organ system
organism

Cells

is a basic unit of structure and function of a living thing.

examples; mutli cell and single celled organism

Tissues

are made of a group of similar cells that work together to do a specific job in the body.

examples; the tissue is makes up the bones

Organ system

is a group of organs working together to perform particular jobs.

examples; tree roots and other parts

is made when a group of organ systems work together.

examples; the organs working together to help the living body

Organisms