Question

Give reasons why multicellular organisms require special organ for exchange of gases b/w their body and their environment

Answer 1

The oxygen demand of multicellular organisms is high and they need special organs to meet this requirement. The other method wold be diffusion but that would take a very long time(3 years for a molecule of oxygen to reach from our lungs to toe). So, to satisfy their need for oxygen there are special organs in multicellular organisms.


Multicellular organisms are coelomates their body is designed in a complex pattern hence they require specialorgans.
A reason is that multicellular organisms need special organs for exchange of gases with the environment because of prokaryotic cells found in the body. The cells are not in contact with the environmentand therefore diffusion would not work in the exchange of gases.