3. Humans and microbes have "complex relationships.
What information in the article best supports this statement?
A. Scientists call bacteria that are harmless to humans "commensal."
B. Antibacterial hand sanitizers can wipe out all bacteria on a patch of skin.
C. Microbes are the oldest form of life on Earth, having first appeared over 3.5 billion years ago.
D. Some microbes benefit humans, while other microbes harm humans.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.