A disease can spread by sneezing or via diarrhea that contaminates drinking water. Before widespread sanitation, the virulence of this disease was observed to be high, with a 10% death rate among infected children. The major mechanism of harm is the severe diarrhea. How would you expect the virulence of this disease to evolve if sanitation practices eliminated transmission via feces and drinking water? It would decrease. It would increase. It would stay the same. No prediction can be made.

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Terrestrial Ecosystem

An ecosystem is a collection of interconnected communities. It includes both living and non-living elements of specific strata. The terrestrial ecosystem is solely related to the ecosystem present on the land and covers 25 to 30% of the total earth’s surface area.