- evolution: change form of organisms or change in frequency of alleles
- natural selection: mechanism of evolution, discovered by charles darwin
- for example, staphloccus aurus which is a lung and skin infection was susceptible to being killed by methecilline, this was called MSSA
- from random mutation one form could break down the methecilline and this was the resistant form called MRSA
- MRSA increases because the MSSA was being killed of because it was susceptible but the MRSA was resistant
- this is natural selection
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