Nature remarkably took care of the survival of the animals relying on two powerful stimuli, pain and pleasure, by which they are violently driven to avoid destructive harm and to pursue salutary and life-preserving activities. Since the elements lost by continuous perspiration had to be restored by food and drink, Nature set up a painful feeling from hunger and thirst so that animals seek food to maintain life. She relied not only on this mechanism to satisfy such an important need but also lured us in making the food pleasant.
KeywordsEmpty Cavity Painful Feeling Alkalify Salt Narrow Canal Pleasant Feeling
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