Most land-dwelling invertebrates and all of the amphibians
A) alter their metabolic rates to maintain a constant body temperature of 37°C.
B) are ectothermic organisms with variable body temperatures.
C) have a net loss of heat across a moist body surface, even in direct sun.
D) become more active when environmental temperatures drop below 15°C.
E) are endotherms but become thermoconformers only when they are in water.
Answer: B