Chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of

The answer to this is NATURAL SELECTION. From the given scenario above, this is classified to be a natural selection because of the changes made by the individuals in order to adapt the presence of this fungal disease. When we say natural selection, this is the ability of an organism to adapt to a certain environment in order to survive. This is according to Charles Darwin which has been the source for the study of evolution.