What occurs when the diaphragm flattens? A) Hiccups
B) Air moves into the lungs, inhalation.
C) Air exits the lungs, exhalation.
D) Air diffuses across the alveoli

the ans is b) Air moves into the lungs, inhalation

Explanation:

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d statement

explanation:

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.