Because of quick and efficient , young adults can rapidly adjust to any stress and bounce back quickly after running a marathon or missing sleep.

Homeostasis

Explanation:

Homeostasis is the ability to maintain a fairly constant internal environment in response to environmental changes. Homeostasis is the automatic maintenance of a steady state or state of balance within the bodies of all organisms. Living things possess inherited or naturally built-in, feedback systems that help them to maintain a stable internal environment, even when the external environment changes. The central nervous system (CNS) plays a significant role in the body's stress-related mechanisms, and the CNS works closely with the endocrine system to regulate these mechanisms.

which of what? i am confused