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.
KeywordsWater Reserve Total Water Content Normal Water Content Xeric Area Glossina Pallidipes
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