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Answer:</h2><h2>☠☠☠⭐⭐</h2>
The efficiency of movement of substances in and out of a cell is determined by its volume to surface area ratio.
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Your answer should be A. by observing the formation of sedimentary rocks.
The following structural changes occur as conducting tubes
become smaller;
- support structures change. The trachea has more hyaline cartilage
than the bronchioles
- epithelium type changes with bronchioles having ciliated
columnar cells with the trachea having tall columnar pseudostratified
- amount of smooth muscle increases as you go lower the respiratory tract
