Question

a population of bacteria may evolve resistance to a drug over time. this graph shows the growth of a bacterial population before and after the introduction of an antibiotic, with some bacteria becoming resistant to the antibiotic. part a - interpreting the graph which time point on the graph shows when the antibiotic was first added? a b c d part b complete previous part(s) provide feedback

Explanation:

When an antibiotic is added, the population of bacteria that are not resistant will start to decline. On the graph, this is indicated by the start of the downward - trend in population size. Point B is where the population size begins to decrease significantly, suggesting the addition of the antibiotic.

Answer:

B.