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The air passes into the lungs through a tube called what?

What is an adaptation of the trachea?

What does the trachea then split into?

Further into the lungs, each bronchi subdivides into what?

What do bronchioles have on their ends?

The alveoli is the?

An alveolus is surrounded by a network of?

Oxygen from the _____ (____ concentration) diffuses into the ________ (________ concentration).

What are the four main adaptations of the alveoli?

How is this beneficial?