All animals are multicellular. The cells that make up multicellular organisms are organized in specific ways to perform speciali
zed functions. Five different levels of cellular organization for a sheep are shown below. Place the levels in order from the most complex level to the simplest level.
The body of a multicellular organism, such as a tree or a cat, exhibits organization at several levels: tissues, organs, and organ systems. Similar cells are grouped into tissues, groups of tissues make up organs, and organs with a similar function are grouped into an organ system.
