Why is it difficult for scientists to find fossils from the precambrian period?
a)there are no rocks left on earth that exist from this period.
b)life did not exist during this period.
c)the life that existed had soft bodies, which rarely left behind fossils.
d)scientists cannot date rocks before the precambrian period.

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.