Topic: Food Energy and Respiration Subtopic: Diseases of the respiratory system
Why is cold caused?
Answer: Cold is caused by neither bacteria nor fungi, it is caused by a special virus which enters the nose and throat breaking down the cells that line up these passages.
- What is an artery?
- What is ratio of water and bacteria in faeces?
- Why should tissue paper or handkerchief used?
- What is stigma?
- What are cross walls?
- How does blood flow in arteries?