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Why has antibiotic resistance evolved in bacteria?

A. All bacteria reproduce very quickly.
B. Bacteria exposed to antibiotics developed a resistance to them.
C. Varieties of bacteria resistant to antibiotics reproduce faster than non-resistant varieties.
D. Bacteria showing resistance to antibiotics survive after antibiotics are used.

User Delphist
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D. Bacteria showing resistance to antibiotics survive after antibiotics are used .
User Henrik Paul
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