Here's a breakdown:
* Cells: The basic building blocks of all living things.
* Tissue: A group of similar cells that work together to perform a specific function.
* Organ: A structure made up of different tissues that work together for a common purpose.
* Organ System: A group of organs that work together to carry out major bodily functions.
For example:
* Muscle tissue: Made up of muscle cells that contract to allow movement.
* Nervous tissue: Made up of nerve cells that transmit signals throughout the body.
* Connective tissue: Made up of cells that provide support and structure, like bones and cartilage.
* Epithelial tissue: Made up of cells that cover surfaces, like skin and the lining of organs.
