I think you are right Katie. The speed of evolution is controlled by many things such as the genetics of a species, the size of a population, and the average length of an organism’s life. In the case of something like a bacteria this means evolution can happen really fast – as has happened in bacteria evolving immunity to antibiotics, for example, which is why we have MRSA now – it didn’t exist in the past.
As Sam says, MRSA is a great example of evolution in action in the modern age. It is a real problem that soon we could run our of antibiotics to treat these superbugs with, which could lead to untreatable infections. This is an example of evolution overcoming extreme selection pressures to find a way to survive.
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