Question

when antibiotics were first developed,most infectious diseases could be controlled by them. today certain bacteria are resistant to many antibiotics.one possible explanation for this change is what?

Answer 1

a few bacteria had a mutation that allowed them to resist the antibiotics, and now most of the bacteria have this mutation.

Step-by-step explanation:

Answer 2

Through mutations in the DNA of bacteria, they can adapt. Only the mutated bacteria would live and keep producing bacteria with the same mutation. Eventually, they would be immune to antibiotics.