Final answer:
Reindeer reduce their body temperature in warmer regions through sweating for evaporative cooling, which is a different mechanism than how polar bears maintain their warmth in cold environments by using thick fur and a dense layer of fat.
Step-by-step explanation:
As compared to cooler regions, in the warmer regions of their habitats, reindeer are able to reduce body temperature more effectively by a. sweating for evaporative cooling. In warm climates, endothermic animals like reindeer need to dissipate excess heat to avoid overheating. Unlike polar bears, which rely on thick fur and a dense layer of fat under their skin to maintain body temperature in cold environments, reindeer increase evaporative cooling to regulate their temperature in warmer areas. This process involves releasing sweat through the glands in the skin, where it then evaporates, removing heat from the body and thus cooling the animal down.