What does multicellularity refer to?

Multicellularity refers to the state of being composed of many cells that work together to form a complex organism. This characteristic allows for greater specialization of cells and the development of different tissues and organs, enabling more efficient functioning and adaptability in various environments. In multicellular organisms, cells can take on specific roles—such as muscle cells, nerve cells, or epithelial cells—contributing to the overall health and functionality of the organism. This contrasts with unicellular organisms, which consist of a single cell that performs all necessary life functions independently. The concept of multicellularity is a fundamental aspect of the biology of complex life forms, including plants, animals, and fungi.