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.
Learn also:
- How is starch processed?
- What is digestion?
- How much is life of red blood cell?
- How can indigestion cured?
- Where is faeces stored?
- How body tries to fight flu virus?