Topic: Food Energy and Respiration Subtopic: Making the air moist, warm and clean
Why we should not breathe through mouth?
Answer: Mouth does not contain mucus, blood vessels near the surface or hair that could trap the dust particles or germs.
- What is job of plasma?
- What is diffusion?
- What happens after white blood cell eats bacteria?
- How long is digestive tract?
- What happens if sufficient oxygen is not present?
- From where does roots take up oxygen?