Question

there are strains of the bacteria that cause tuberculosis that are resistant to almost every antibiotic. this has led to an increase in the number of cases of tuberculosis. what most likely led to the increase in antibiotic resistant strains of bacteria?
○ artificial selection
○ eukaryotic evolution
○ geographic isolation
○ natural selection

Explanation:

Natural selection is the process where organisms better adapted to their environment tend to survive and produce more offspring. In the case of bacteria, when antibiotics are used, bacteria that have mutations making them resistant (better adapted to the antibiotic - containing environment) are more likely to survive. They then reproduce, passing on the resistance trait. Over time, this leads to an increase in antibiotic - resistant strains. Geographic isolation refers to the separation of populations of organisms by physical barriers, which is not relevant here. Artificial selection is human - directed breeding, which is not the case for bacteria in the wild. Cyclic evolution is not a commonly - used term in this context.

Answer:

natural selection