The respiratory system helps the body take in the oxygen it needs to survive. A branching network of tubes takes oxygen into the lungs to get the job done. Explore more about this important body system with content tied to the curriculum of upper-elementary and middle school students and easy-to-understand text written at a 3rd grade reading level. Dyslexia-friendly font and design make learning accessible, while a recap at the end promotes checking for understanding to aid in comprehension. It's key biology curriculum made approachable for all.