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Professor Matt Covill Biology 120 Writing Assignment # 1 November 23, 2005. Do Parasites Rule The World? Parasites are more abundant than free-living organisms in the world. They may be found in nearly every phylum of animals, from protistan phyla to chordates, exhibit marvelous strategies for adaptation to their hosts. Parasitic diseases continue to be major threats to health for the world's population, have strong negative impacts on animal welfare and modern agriculture and are considered as biological indicators of environmental pollution. Parasites have pervasive influences in populations. They rule human and animal behavior, and affect a world history. By draining host nutrients, they alter how much energy and how many nutrients the population is withdrawing from the habitat. Weakened hosts are more vulnerable to predation and less attractive to potential mates. Some infections result in sterility. Some may alter the ratio of host males to females. In such ways, parasitic infections lower the birth...

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