How does evolution or natural selection relate to the susceptibility of disease

Evolution or Natural selection relate to the susceptibility of disease because the disease if lethal would kill the speacies suseptible to that disease but the remainder of the species that was immune to the disease would live and produce more offspring with the gene that made them unsusceptible to that disease.

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for