The concept that new varieties of organisms are still evolving is best supported by the:
A. increasing need for new antibiotics.
B. increasing number of individuals in the human population.
C. decreasing number of new fossils discovered in undisturbed rock layers.
D. decreasing activity of photosynthetic organisms due to warming of the atmosphere.
It is believed that certain pathogens have adapted to the antibodies that we have, becoming resistant. These species are actually evolving, or changing through time, to include the resistant gene for the antibiotics. Therefore the pathogens with the gene survive, and pass on the resistant gene, which causes it to increase.