Sid races around his room and finds himself breathing really fast. Sid then wonders where all the air is going in his body when he breathes in? At school, Sid and his friends discover that our bodies have lungs to help us breathe in oxygen!
Sid races around his room and finds himself breathing really fast. Sid then wonders where all the air is going in his body when he breathes in? At school, Sid and his friends discover that our bodies have lungs to help us breathe in oxygen!
