Question

3. Why do multicellular animals need an efficient excretory system? How does excretion take place in plants?

Answer 1

Answer:

unicellular organisms are in direct contact with environment and multicellular organisms are not in direct contact with environment

Explanation:

it is their only

Answer 2

• Multicellular organisms need an efficient excretory system because they are not in the direct contact with environment.  

• They excrete waste from them by diffusion, transpiration

EXPLANATION:

They eat food to get nutrition. Each cell produces some waste and all that waste is carried out though a specialized organ.

Plants do not have specialized system for excretion just like animals so it is not difficult for plants to get rid of waste in them.