Question

multiple choice question
endotherms regulate their body temperature mostly using heat generated by
their metabolism.
laying in the sun.
basking on warm rocks.
burrowing into the ground.

Explanation:

Endotherms are organisms that can maintain a stable body temperature regardless of the external environment. They generate heat mainly through metabolic processes. Laying in the sun, basking on warm rocks, and burrowing into the ground are methods used by ectotherms (organisms that rely on external sources of heat) to regulate their body temperature.

Answer:

their metabolism.