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Based on the provided information, all of the options listed are functions of the Nervous system. Let's break it down:
1. The Nervous system is responsible for sensing and interpreting external stimuli, including temperature changes. This process is essential for detecting hot or cold environments, thus "telling" you about your external environment.
2. Reaction to the external environment is a key function of the Nervous system. It allows you to respond to various stimuli such as touching a hot surface and quickly retracting your hand to avoid injury.
3. Homeostasis regulation is another critical function of the Nervous system. It helps maintain a stable internal environment by regulating body temperature, blood pressure, and other physiological processes.
In conclusion, the Nervous system plays a vital role in all of the functions mentioned in the options provided. It is involved in sensing, reacting, and regulating various aspects of our internal and external environments.
