What is the body's tendency to maintain relatively stable internal conditions in spite of greater changes in its external environment called?

Answer: Homestasis

Maintaining blood temperature is one of homeostasis example. Mamalia is an animal group called warm-blood because their body temperature is maintained. By keeping the body temperature stable, the enzyme used in the body can work in optimal temperature. That makes them use energy more efficiently.

Homeostasis is the body's tendency to maintain relatively stable internal conditions in spite of greater changes in its external environment. It is a process in which all body cells are involved and through which the body systems stays stable and keeps constant internal environment. Homeostasis enables the body to maintain its balance and stability.