Most Land-Dwelling Invertebrates and All of the Amphibians

Question

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

Accepted Answer

Land-dwelling invertebrates and amphibians are ectothermic organisms, which means they rely on external sources of heat to regulate their body temperature. They do not have the ability to alter their metabolic rates to maintain a constant internal temperature like endothermic organisms such as mammals and birds. They also have a net loss of heat across their moist body surface, which can make it difficult to maintain a consistent body temperature, even in direct sun.