Why is a human and a plant multicellular?

Both humans and plants are multicellular organisms because their cells have specialized functions and work together to carry out various biological processes. In multicellular organisms, different types of cells perform specific functions, such as nutrient absorption, waste removal, reproduction, and defense against pathogens. This specialization allows multicellular organisms to be more complex and efficient in their growth, development, and survival compared to single-celled organisms.