Topic: Food Energy and Respiration Subtopic: Introduction
How does air enter our lungs?
Answer: When we exhale, there is a pressure difference inside and outside of the lungs. To maintain that pressure air enters the lungs.
- How is food absorbed?
- What are proteins and functions?
- What is sexual reproduction?
- What is food poisoning?
- Why is heart useful?
- What are some major causes of asthma?