Question

Explain the need for ventilation systems in a multi-cellular organisms

Answer 1

it helps in preventing Carbon dioxide which is your CO2 from entering the cell...In order to obtain oxygen

Answer 2

If you can imagine yourself not breathing but guess what u are actually breathing but u are not letting in the right air into your lungs this are you will be letting in that period of time will be CO2....Which blocks Oxygen from coming in....That is why it is advisable to stay in a ventilated area to avoid Lack of breath

Answer 3

The question is about transport of gases within an organism whose cells are in constant physical contact and exchange with the external environment.

Unicellular organisms are always in contact with the external environment, but multicellular organisms have cells in layers, the inner layers cannot undergo gas exchange with the environment and thus need a system for transport.