Torpor is always associated with _____
high environmental temperatures and low water supplies
reduced metabolic rate and body temperature
cold environmental temperature
the production of cellular antifreeze
The transfer of thermal motion between molecules of objects that are in direct contact is called _____
When a dog picks a sunny and sheltered spot in the yard for a nap on a cool fall day, what mechanism of heating is the dog taking advantage of?
How do feathers help thermoregulation by birds?
Feathers are very warm and help retain heat.
Feathers return heat to the body by a countercurrent mechanism.
Feathers are metabolically active and thus generate metabolic heat.
Feathers can trap a layer of insulating air next to the skin