Here's why:
* Cells: The basic building blocks of all living organisms.
* Tissue: A collection 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.
Examples of tissues:
* Muscle tissue: Responsible for movement.
* Nervous tissue: Transmits signals throughout the body.
* Connective tissue: Supports and connects other tissues (e.g., bone, blood, cartilage).
* Epithelial tissue: Covers surfaces and lines cavities (e.g., skin, lining of the digestive tract).
