Why is it important for nitrogen to be more abundant in our atmosphere than oxygen? A. Oxygen is only breathable if diluted with nitrogen.

B. Nitrogen and oxygen combine to produce weather that is essential for life.

C. Oxygen must be diluted because it is a highly combustible gas.

D. Nitrogen is a heavy molecule that pulls oxygen, a light molecule, to the surface for oxygen-dependent life to use.

Sally, age 3 months, has a moist, red, vesicular rash on her cheeks, the backs of her hands, and her arms. her mother said sally was constantly trying to scratch the rash and often has difficulty sleeping. her father has a family history of allergic rhinitis and asthma. discussion questions. 1. review atrophic dermatitis from chapter 3 and discuss the pathophysiology of sally’s symptoms. 2. why is the father’s medical history significant, and what can sally expect as she grows up? 3. discuss the need to limit scratching, and describe practical methods to achieve this.