The main difference between endotherms and ectotherms is _______?

اینڈوڈرمز اور ایکٹوتھرم کے درمیان بنیادی فرق _______ ہے؟

Where they get most of their body heat

How they conserve water

Whether they are warm or cold

None of these

Endotherms (e.g., birds, mammals) generate body heat internally through metabolism.

Ectotherms (e.g., reptiles, amphibians) rely on external environmental sources for heat regulation.