In the current animal classification system is thought to have originated once, and is thought to have evolved multiple times.
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Ответ:
Ответ:
the ans is b) Air moves into the lungs, inhalation
Explanation:
Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs.hope it's helpful to you ☺️