B. They become extinct
Please mark as brainliest if this helped!
The correct answer is c. Genetic Variation. Bacteria are very numerous, ad random mutation of bacterial DNA generates a wide variety of change, including resistance.
The bell shaped curve indicates polygenic traits. A polygenic trait is controlled by multiple alleles. Hope this makes sense :)
Answer:
10. 50 ehaisnenhsiwolen br isiwokneb
