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.
- Why blood is medium?
- What happen when we exhale?
- What is ovule?
- How many parts does flower has?
- What is result of viruses when we sneeze?
- What are platelets?