Photovoltaic cells are used in solar lighting, often used to light up a sidewalk or garden. The lights gather energy from the sun during daylight hours in order to shine at night. Which of the following is the main element used to produce electricity in a photovoltaic cell? A) gaseous hydrogen
B) solid silicon
C) Liquid water

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.