What is a key trait of a multicellular organism?

Question

Quizplus · Accepted Answer

A key trait of a multicellular organism is that there is a division of labour among its cells. Different cells have different functions and work together to maintain the overall function and survival of the organism. While multicellular organisms typically have many cells, this is not the defining trait. Similarly, while some multicellular organisms may have cells that are similar in shape, this is not necessary or defining for multicellularity.

What Is a Key Trait of a Multicellular Organism