Malaria, a type of parasite, infects 500 million people each year by infecting the red bloodcells of its host. The virus, HIV, that causes AIDS, reports 50,000 newly infected persons. Which statement best differentiates the pathogens, parasites and viruses? A. All though both rely on other living organisms to survive, viruses are usually beneficial.

B. Although both rely on other living organisms to survive, parasites feed on the host organism.

C. Although both are living organisms, parasites depend on the cells of living things to reproduce.

D. Although both are living organisms, viruses break down dead plants and animals that other organisms use.