1. The problem asks to complete the sentence about multicellular organisms and their cells. 2. Multicellular organisms have many different types of cells that perform various functions to support the whole organism. 3. The key concept is that all cells in a multicellular organism contain the same DNA but have different functions due to gene expression. 4. Therefore, the correct completion is: "Multicellular organisms are able to be large and complex because they have many different cells that have the \textbf{the same} DNA and \textbf{different} functions." 5. This means all cells share the same genetic information but specialize to perform unique roles. Final answer: the same...different