**PLEASE HELP** A student became ill on three occasions throughout the year. Each time, he was prescribed the same antibiotics since he was diagnosed with the same illness. What will likelyhappen if the student becomes ill again, and the same antibiotics are prescribed?

The antibiotics which were effective before will still work because bacteria never alter their DNA sequences.

The antibiotics which were effective before will still work because bacteria never alter their DNA sequences.

The antibiotics which were effective before may not work this time because bacteria undergo mutations.

The antibiotics which were effective before may not work this time because bacteria undergo mutations.

The student will not require the prescription because the antibiotics helped him build up immunity.

The student will not require the prescription because the antibiotics helped him build up immunity.

The student will need twice the dosage of antibiotics to fight the same level of infection due to resistance.

The student will need twice the dosage of antibiotics to fight the same level of infection due to resistance.