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Bacteria develop resistance to antibiotics through the process of natural selection. The antibiotic will kill most of the population of bacteria but not all because some of them already have the resistance. Also if the antibiotic is not utilized correctly ( according to a physicians instructions ) some of the more hardy individuals of the bacteria population will live. These bacteria breed and produce offspring that are also more resistant to antibiotics. Generations of bacteria happen much more rapidly than with people so the ability of bacteria to adapt to new environments is much more robust with respect to time.

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