Biology 2601A/B Lecture Notes - Testicle, Heterothermy, Ectotherm

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The explored temperature range for the environment may vary from -238 c (the surface of the moon) to 5,430 c (the earth"s core). We, along with most of the organisms on earth, live within the aquatic environment of the hydrosphere where there is a 4 c temperature range. The greatest range for oceanic organisms lies in places such as the deep sea vents and the polar seas. As human beings are classified as homeothermic endotherms, and are thus responsible for regulating their body temperature, they (along with birds and other mammals) can live in higher temperature ranges that often fluctuate. As mentioned previously, mammals and birds can survive wide temperature ranges on earth. Other ectothermic organisms such as turtles have a much slower metabolism in colder temperatures. What is remarkable is the fact that both mammals and birds have evolved their endothermic traits independently of each other; depicting physiological convergence as a solution to the thermal problem.

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