The dots represent a bacterial infection sal was very sick with this bacterial infection the infection was treated with antibiotics so seemed to be getting well but in a few weeks she was sick again how can this be explained using the natural selection
The recurrence of the bacterial infection in Sal even after treatment with antibiotics can be explained by natural selection. Bacteria have the ability to evolve and develop resistance to antibiotics through the process of natural selection. When Sal was first infected, the antibiotics may have killed off most of the bacteria, but some may have had genetic mutations that allowed them to survive and reproduce. These resistant bacteria then multiply and spread, leading to a resurgence of the infection.
In this case, the initial round of antibiotics applied selective pressure on the bacterial population, favoring those that were resistant. As a result, the next generation of bacteria that Sal was exposed to were more likely to be resistant to the same antibiotics, making them less effective in treating the infection.
This phenomenon highlights the importance of responsible antibiotic use and the development of new treatments to combat antibiotic-resistant bacteria. It also underscores the power of natural selection in driving the evolution of bacteria and other pathogens.