What is the term for organisms composed of many cells?

Organisms composed of many cells are known as multicellular organisms. This term highlights the complexity and organization of these life forms, which are made up of multiple cells that work together to perform various functions. In multicellular organisms, cells often differentiate into types that specialize in different tasks, contributing to the overall functioning and survival of the whole organism.

For example, in animals, there are specialized cells for muscle, nerve, and epithelial functions, while plants have different cells dedicated to processes like photosynthesis and nutrient transport. This level of cellular organization allows multicellular organisms to achieve greater complexity and adaptability compared to unicellular organisms, which consist of a single cell that performs all necessary life functions independently.