Staphylococcus aureus is a species of bacteria that have invaded the human body for a long time.
Humans scientifically created an antibiotic, methicillin, to fight off the bacteria, but in return, the
Staph bacteria developed resistance to the methicillin and are now considered a new strain called
methicillin-resistant Staphylococcus aureus (or MRSA.) Therefore, humans had to develop even
stronger antibiotics to fight it. What pattern of evolution does this exhibit?
Answers: 1
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