Which of the following is the most probable reason for the success of mammals on the Earth?

The success of mammals, according to evolutionary biologists, is largely due to their capacity to keep a steady body temperature and thrive, whether they are in Antarctica or the Sahara desert. Some organisms can achieve homeostasis through physiological mechanisms, such as maintaining a consistent body temperature, osmotic concentration, and so on.  All birds and mammals, as well as a few lower vertebrate and invertebrate species, can regulate themselves (thermoregulation and osmoregulation). Most mammals utilise processes that are comparable to those used by humans to regulate their body temperature.

We keep our body temperature at 37°C. We sweat abundantly in summer when the ambient temperature is higher than our body temperature, resulting in evaporative cooling.

When the temperature drops below 37°C in the winter, we begin to shiver, a type of activity that generates heat. This elevates the body temperature.