In many cities, wastewater travels through sewer lines to be processed at a wastewater-treatment plant. The treatment plant uses many methods to
break down materials in wastewater and make sure materials are safe before
release. Which of the methods used during treatment is meant to kill diseases in materials in wastewater?
A. Burying of solid waste
B. Aeration of liquid waste
C. Heating of liquid waste
D. Settling out of solid waste

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)