Penicillin is a drug that kills bacteria. Today, many bacteria are resistant to this drug. 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.
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Penicillin is a drug that kills bacteria. Today, many bacteria are resistant to this drug. How does...
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