Some organisms, like lizards who bask in the sun, use to help regulate their environment.

location; internal

Explanation:

The reptiles are the cold-blooded animals and because of this reason, their body does not produce warmth to stabilize their internal temperatures. To maintain their internal temperature, the lizards can be witnessed laying under to sun. This helps them to gain warmth from the sun and maintain the internal temperature of their bodies. Basking in the sun also helps them in stimulating the metabolism of their body.