Although ectotherms can tolerate large ranges in external temperature, they are unable to sustain large
fluctuations in their internal temperatures. Indicate whether the statement is true or false.
ANS: F
Ectothermic marine organisms have an internal temperature that stays very close to that of their
surroundings. Endotherms are unable to tolerate large internal temperature changes despite their
tolerance for external changes. Endotherms have developed various thermoregulatory mechanisms to
live in a wide range of habitats. Information can be found in the section Marine Life Success Depends
upon Physical and Biological Environmental Factors.
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