Answer :

Final answer:

Resistant bacterial strains have evolved due to the excessive use of antibiotics, particularly when they are not needed or are used in livestock feed. This leads to the natural selection of resistant bacteria, increasing the risk of untreatable infections. Misuse of antibiotics for viral infections and in animal agriculture significantly contributes to this problem.

Explanation:

The indiscriminate use of antibiotics has led to natural selection of bacteria that can survive despite the presence of these drugs. When antibiotics are used to treat infections, they typically kill the susceptible bacteria, leaving behind those that have resistance. These resistant bacteria then reproduce, increasing the proportion of resistant forms in the population.

One of the main issues is misuse of antibiotics in cases where they are not effective, such as with viral infections like colds or the flu. Additionally, the routine use of antibiotics in livestock and their inclusion in animal feed have greatly contributed to the problem. This practice promotes development of resistant strains that can be transferred to humans through consumption of meat and other products derived from these animals.

The evolution of antibiotic resistance can also occur through lateral gene transfer, where resistance genes are passed on from one bacterium to another. This process can rapidly spread resistance across a bacterial population, making it more difficult to treat infections with existing antibiotics.

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Rewritten by : Barada

Answer: antibiotics

Explanation: because exposing bacteria over and over to antibiotics it gives them the chance to develop immunities to the antibiotic making it useless