Contraction of the diaphragm and external intercostal muscles results in in the thoracic volume which results in of the intrapulmonary pressure.

Contraction of the diaphragm results in increase in thoracic volume which results in decrease of the intrapulmonary pressure.

Explanation:

During inspiration, air is taken into the lungs this requires that the diaphragm contracts to increase the volume of the thoracic cavity while intrapulmonary pressure decreases to allow intake of air.

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only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.