Relative to ectotherms like fish, endotherms like mammals have ______.
a. higher rates of Na+ and K+ leak across their cellular membranes
b. higher concentrations and activities of the Na+/K+ ATPases in their cellular membranes.
c. lower rates of oxygen consumption per gram
d. a and b are correct
e. a, b and c are correct
Answer: d. a and b are correct
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