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.
- What is indigestion?
- What is ovary?
- Why is transpiration important?
- Some white blood cells do not eat bacteria what do they do?
- What is digestion?
- How can xylem be described?