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 flu?
- How many parts does flower has?
- What happens when atria are full of blood?
- What are stomata?
- How can large molecules pass through digestive tract?
- What is absorption?