Answer:
When the diaphragm contracts (it's a large flat muscle), it pulls the lungs down this causing expansion which eventually lead to inhalation of air. If it's injured, then that will be affected.
This is because HIV weakens the immune system and so the body becomes more susceptible to infections or illnesses
Answer:
Occur later in development
Prokaryotic have no organelle but the eukaryotic do have cells
