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
Made of a single cell
Specialized cells
Cells that perform specific functions to benefit the entire organism
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