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What are the microscopic air sacs where gas exchange occurs in mammals and reptiles called?
What are the microscopic air sacs where gas exchange occurs in mammals and reptiles called?
In birds, what are the microscopic air sacs where gas exchange occurs known as?
In birds, what are the microscopic air sacs where gas exchange occurs known as?
Which organ branches in the middle of the chest into the two main bronchi?
Which organ branches in the middle of the chest into the two main bronchi?
What is the largest system of airways in the respiratory system?
What is the largest system of airways in the respiratory system?
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What is the biological system used for gas exchange in animals and plants known as?
What is the biological system used for gas exchange in animals and plants known as?
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