Question

in single celled organism diffusion is sufficient to meet all there requirements of food exchange of gas but not in multicellular organism explain the reason for difference​

Answer 1

Answer:Below

Explanation: Because in single cellular organism the whole cell touches the environment and it can exchange gases on its own, but in multicellular organism all cells don't have contact with the environment so specialised organs are need for exchange of gases.

Hope this helps you

Answer 2

Well.... in case of single celled organism, it's whole body is in the contact with the atmosphere but this is not the case with multicellular organisms that's why diffusion isn't sufficient to meet all the requirements of the multicellular organisms.....