Final answer:
Early signs of hypoxia, such as restlessness and anxiousness, are indeed true indicators of the body's response to insufficient oxygen levels.
Step-by-step explanation:
The statement that early signs of hypoxia are restlessness and anxiousness is true. When the body experiences a lack of oxygen, it can lead to a variety of symptoms including restlessness and anxiety, which are often signs of early hypoxia.
The human body requires a consistent and adequate supply of oxygen to maintain energy homeostasis. Even slight deviations in the environment's oxygen levels, such as those experienced at high altitudes like the Rocky Mountains, can induce symptoms of hypoxia.
These symptoms occur because the body is attempting to signal the brain about the inadequate oxygen levels, prompting the person to take actions that could help increase oxygen intake, like breathing more deeply or slowing down physical activity.