(18pts)
penicillin is a drug that kills bacteria today many bacteria are resistant to disease how does natural selection best explain this observation?

a) penicillin causes some bacteria to mutate
b) some bacteria survive penicillin and reproduce.
c)resistant bacteria cannot be attacked by penicillin
d) resistant bacteria mutate more quickly than normal bacteria
explain your answer, !

The answer is C)Resistant bacteria cannot be attacked by penicillin

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.