•what is mrsa, why does it pose serious health risks especially for a health care professional, and how is antibiotic resistance an example of evolution?

Methicillin-resistant Staphylococcus aureus

It poses a serial health to both patient and physician who is a health care professional because this particular type of baterium can be both airborne and bloodborne. 

This particular bacterium is resistant to antibiotic because of evolutionary process that prevails among the animal kindgom. These evolutionary process made these baterium insusceptible to antibiotics because of its change in DNA compositions.