True / False Questions 29.In a homeostatic system, the integrating system executes changes to compensate for deviances from the set point. 30.All vertebrates other than mammals are ectothermic. 31.Most invertebrates, such as the annelid, have nephridia. 32.Freshwater fish drink water all the time to compensate for their tendency to lose water. 33.Marine mammals, like whales, do not drink seawater. 34.Mammals and amphibians are the only vertebrates that produce urine that is hypertonic to their body fluids. Â Â
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