Final answer:
Hunger is the physiological need to maintain the body's energy resources, driving organisms to seek food and obtain energy.
Step-by-step explanation:
Hunger is the term for the physiological need to maintain the body's energy resources. It is a biological mechanism that drives organisms to seek food and obtain energy. For example, when glucose levels in the blood rise after a meal, the body responds by adjusting its activities to lower them and distribute the nutrient to tissues that need it.