The term that identifies a group of cells that work together to perform a similar function is tissue.

Here's a breakdown:

* Cells: The basic building blocks of life.

* Tissues: Groups of similar cells that work together to perform a specific function.

* Organs: Structures made up of different tissues that work together for a common purpose.

* Organ Systems: Groups of organs that work together to carry out major bodily functions.

For example, muscle tissue is made up of muscle cells that contract to allow movement, and nervous tissue is made up of nerve cells that transmit signals throughout the body.