Question

In single celled organisms diffusion is sufficient to meet all their requirements of food , exchange of gases or removal of wastes but it is not in case of multicellular organisms . Expla8n the reason for this diff.

Answer 1

In single celled organisms diffusion is sufficient to meet all their requirements of food , exchange of gases or removal of wastes but it is not in case of multicellular organisms because all cells of multicellular organisms are not in directly contact with environment.So, they have specific organs.

Answer 2

Answer:

beacause a single cell is responsible for all

but in multicellular it is not