Questions and Answers
What are the microscopic air sacs in mammals and reptiles called?
Alveoli
What are the respiratory surfaces in land animals internalized as?
Linings of the lungs
What are the microscopic air sacs in birds known as?
Atria
What is the largest hollow tube that communicates with the external environment?
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What is the name of the system of airways that communicate with the external environment?
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