Final answer:
Homeostasis is crucial for organisms to maintain stability in internal conditions against environmental changes.
Explanation:
Homeostasis is the characteristic of life that focuses on an organism's ability to maintain a stable internal environment despite external changes. For instance, regulating body temperature through thermoregulation allows organisms like polar bears to survive in varying temperatures by utilizing body structures for insulation. This self-regulation ensures constant internal conditions, a crucial aspect of living organisms.
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