Answer:
is used by commercial airplanes
Explanation:
The stratosphere is used by most commercial airplanes. This is because this layer of earth is stratified and more stable.
- The lowest level of the atmosphere is the troposphere.
- This layer is where all the bulk of the atmospheric gases are domiciled.
- Weather conditions occur here.
- This layer is not safe for flight due to its turbulent nature.
- The ionosphere is responsible for the transmission of radio signals around the earth.
- The earth's weather occurs in the region of the troposphere.
The respiratory system takes oxygen from the air and sends it from the alveoli to the circulatory system. The circulatory system carries the oxygen and glucose to your cells for energy. And lastly, the digestive system to carry the nutrients and remove the waste.
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