Over 99% of all the molecules in a living arthropod are water molecules, but because of the very high molecular weights of the large organic molecules of animal tissues, water content expressed as a precentage of total weight is very much less than its mole fraction—about 70%. In fact, as Table 1 shows, water content is very variable, both within and between species of arthropods, and we may briefly consider the reasons for such variability.
KeywordsPermeability Dust Hydration Depression Dehydration
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