Final answer:
Multicellular organisms are made up of more than one type of cell and have specialized cells that work together to carry out specific functions. These organisms exhibit organization at different levels, including tissues, organs, and organ systems.
Step-by-step explanation:
Multicellular organisms are organisms that are made up of more than one type of cell and have specialized cells that are grouped together to carry out specialized functions. The cells of a multicellular organism would not survive as independent cells and need to work together to function properly. Multicellular organisms exhibit organization at several levels, including tissues, organs, and organ systems.