Many kinds of disease-causing bacteria are resistant to the standard antibiotics that we use to control them. This is because
A) when bacteria are exposed to antibiotics they mutate.
B) there is genetic variety within the species and those that already have genes for resistance are the ones that reproduce.
C) new species of bacteria have evolved that are resistant to antibiotics.
D) when the size of the population of a species of bacterium is reduced, genetic variety decreases.
Correct Answer:
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