Tolerance Range of Animal to Gradient of Temperature
 
Organisms have ranges of tolerance for environmental factors.The range will be the high and low extremes of tolerance for an environmental factor. Organisms have specific requirements for successful growth, development and reproduction.
Example: There may be a coldest temperature and hottest temperature an animal can survive in their environment.  That is their range of tolerance.
 
Animal has optimum condition too. optimum condition is a condition that are most favorable for an organism to survive, grow and reproduce.
This optimum is somewhere within the range of tolerance for that organism.
 
If an animal has a range of tolerance for temperature of 0-85 degree F somewhere within that temperature range will be the temperature that the animal grows best.
 
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