Read the following passage and answer if the question is true or false.
Passage: The effects of high altitude on humans are considerable. The percentage oxygen saturation of hemoglobin determines the content of oxygen in blood. After the human body reaches around 2,100 m (7,000 feet) above sea level, the saturation of oxyhemoglobin begins to decrease rapidly. However, the human body has both short-term and long-term adaptations to altitude that allow it to partially compensate for the lack of oxygen. Athletes use these adaptations to help their performance. There is a limit to the level of adaptation; mountaineers refer to the altitudes above 8,000 metres (26,000 ft) as the ``death zone'', where it is generally believed that no human body can acclimatize.

Question: is it hard to breathe at 7000 feet?

Is the answer True or False? Respond with only "True" or "False" and no additional text.
True. The passage states that the saturation of oxyhemoglobin begins to decrease rapidly in humans after they reach around 7,