An animal ordinarily is confronted by more than one stimulus at a time. Stimuli also impinge sequentially. Animals in practical settings generally need to cope with multiple stimuli.
A range of tolerance sets limits for an environmental factors within which an animal can readily cope, thrive, reproduce, survive i.e., experience wellness. Outside this range are the upper and lower ranges of resistance. If an animal resides long enough outside its tolerance range, it eventually will die due to environmental stress.
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