Cell theory
A widely accepted explanation of the relationship between cells and living things.
Cell
The basic unit of structure and function in living things.
Multicellular
Consisting of many cells.
Unicellular
Consisting of one cell
Specialized cells
Cells that perform special functions
Tissue
A group of similar cells that perform a specific function.
Organ
A body structure that is composed of different kinds of tissues that work together.
Organ system
A group of organs that work together to perform a major function.