The diagrams show the result of incubating two species of bacteria, P and R, on separate Petri dishes each containing nutrient agar.
Three filter paper discs have been added to each Petri dish.
Which statement is correct?
1 )
Antibiotics X and Y are resistant to bacteria P.
2 )
Bacteria P are resistant to both antibiotics.
3 )
Bacteria R have a mutation that makes them resistant to antibiotic Y.
N is a control disc showing bacteria R grow when antibiotic Y is not present.
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