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 oxygenated blood?
- What is chlorophyll?
- What is quantity of re blood cells in blood?
- Which harmful chemical is black in color?
- What is digestive system?
- How much is life of red blood cell?