Which term best characterizes the concept of homeostasis?

The answer is "relatively stable internal environment".

Homeostasis is a key idea in seeing how our body functions. It implies keeping things steady and originates from two Greek words: 'homeo,' signifying 'similar,' and 'stasis,' signifying 'stable.' A more formal meaning of homeostasis is a normal for a framework that controls its inside condition and has a tendency to keep up a stable, moderately consistent, state of properties.  

Homeostasis is going on always in our bodies. We eat, sweat, drink, move, eat some more, have salty fries, but then our body organization remains nearly the same.

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