In contrast to ectotherms, endotherms

Amaintain a lower metabolic rate
Bcreate and conserve body heat
Cneed less to eat
Dare more efficient in warm enviroments

Verified Answer :

b) create and conserve body heat


Endothermy is a physiological characteristics that enables  some animals to control their body temperature unlike exothermics. This mechanism is important due to sudden change in temperature or uncontrollable conditions set by the harsh environment. 
So birds sharks salamanders and other related animals have this function.