Heterotherms Differ from Endotherms in That Only Heterotherms

Multiple Choice

Heterotherms differ from endotherms in that only heterotherms

A) can regulate their own body temperature.
B) have body temperatures determined primarily by external sources of heat.
C) maintain a constant body temperature despite changes in outside temperature.
D) always have a negative Q₁₀.
E) can sometimes behave as endotherms and at other times as ectotherms.