Multicellular organisms have many cells. what is the one other characteristic they must have before they can be called multicellular

The cells must be specialized.

For a single cell or commonly known as unicellular, for them to become a multicellular cell, one must undergo specialization. Multicellular organisms consist more than one cell. It is the opposite of unicellular organisms. Examples of multicellular organisms are animals and plants.

The answer is a. i hope this