The digestive system and respiratory system are types of physical barriers.

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Author Question: The digestive system and respiratory system are types of physical barriers. (Read 80 times)

bobbie

Hero Member
Posts: 592

on: Apr 1, 2019

The digestive system and respiratory system are types of physical barriers.

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Anatomy, Physiology, and Disease: An Interactive Journey for Health Professions ¦ Colbert, Ankney, Lee ¦ 2^nd Edition

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DylanD1323

Sr. Member
Posts: 314

Reply #1 on: Apr 1, 2019

true

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