Answer :
Final answer:
Antibiotic-resistant bacteria survive and multiply, genetic changes contribute to resistance, and population-level resistance emerges due to selective pressure.
Explanation:
Antibiotic-resistant bacteria survive and multiply while antibiotic-sensitive bacteria die out due to the selective pressure of antibiotics. This phenomenon occurs through natural selection, where the resistant bacteria have a survival advantage.
As bacteria evolve through genetic changes, they develop resistance to antibiotics, which they pass on to their descendants. The misuse and overuse of antibiotics have accelerated this process of resistance.
Population-level resistance emerges when some bacteria carry resistance genes and survive antibiotic treatment, leading to the proliferation of resistant strains and making treatment of infections more challenging.
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