Every summer, Mary spent sunny days out in the sun. She never wore a hat or sunscreen. When she became a teenager, Mary started lying in a tanning bed before summer arrived. By the time Mary was 25 years old, she had begun to get small sores on her arms and shoulders.

It is very likely that Mary will end up with some form of

A)
HIV/AIDS.

B)
skin cancer.

C)
bacterial infection.

D)
Parkinson's disease.

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°