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:
- What is ratio of water and bacteria in faeces?
- How many types of pollination are there?
- What is bronchiole?
- What plants do if water intake is less?
- What is transpiration?
- What are enzymes?