Mosquitos are usually just carriers of disease agents and not the definitive hosts. When a disease agent spends only a portion of the life cycle in an organism, that organism, in our case, the mosquito is called a disease vector.
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The Isopropanol had a lower heat of vaporization than that of water, meaning that it didn't have to have as much energy to accomplish a phase change, in this case evaporation.
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In On the Origin of Species, Darwin claimed that there was a continual 'struggle for existence' in nature, in which only the fittest would survive. This theory came partly from his reading of Thomas Malthus's Essay on the Principle of Population.
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