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Magazine Problem 1
What constraints are imposed by a diet of plants as compared to one of animal tissues?
Problem 3
In Figure \(7.16,\) why does mass-specific metabolic rate (metabolic rate per unit weight) of mammals increase with decreasing body mass?
Problem 4
Why are the largest species of poikilotherms found in the tropical and subtropical regions?
Problem 5
How might you expect the average size of mammal species to vary from the tropics to the polar regions? Why?
Problem 8
What behaviors help poikilotherms maintain a fairly constant body temperature during their season of activity?
Problem 9
How does the size and shape of an animal's body influence its ability to exchange heat with the surrounding environment?
Problem 10
Contrast the problem of maintaining water balance for freshwater and marine fishes.
Problem 12
How does countercurrent circulation work, and what function does it serve?
Problem 13
Distinguish between hibernation and torpor.
Problem 15
Define circadian rhythm.
