Every human has to breathe, but how do we do it - and why? This detailed non-fiction book clearly explains the breathing process, how your lungs are connected to the rest of your body, using detailed diagrams for support. Topaz/Band 13 books offer longer and more demanding reads for children to investigate and evaluate.Every human has to breathe, but how do we do it - and why? This detailed non-fiction book clearly explains the breathing process, how your lungs are connected to the rest of your body, using detailed diagrams for support. Topaz/Band 13 books offer longer and more demanding reads for children to investigate and evaluate.