The lungs have no skeletal muscles of their own. The work of breathing is done by the diaphragm, the muscles between the ribs (intercostal muscles), the muscles in the neck, and the abdominal muscles.
Answer:
I believe the correct answer from the choices listed above is option A. The possible explanation of the statement above would be because the groundwater has been exhausted. Because of such the pressure beneath needs to be in equilibrium with the one above causing the ground to sink.
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Hydrogen isotopes deuterium and tritium
