What term describes an organism made of more than one cell?

• A. Multicellular
• B. Unicellular
• C. Specialization
• D. Cell Division

Answer: (A)

Multicellularity is the state of being composed of many cells that cooperate and remain integrated. In these organisms, cells often differentiate into specialized types and form tissues, organs, and organ systems, all coordinated to support the organism’s life. This teamwork among cells enables greater size, complexity, and division of labor that single cells can’t achieve alone. The term for organisms made of a single cell is unicellular, describing bacteria, many protists, and yeasts. Specialization refers to the process by which cells take on different functions within a multicellular organism, contributing to the overall organization, but it is not the term for the organism’s structure. Cell division is the process that creates new cells and supports growth, not the description of how many cells make up an organism. Humans, trees, and mushrooms are examples of multicellular organisms.