In the lower respiratory tract,cartilage plates first appear at the
A)primary bronchi.
B)secondary bronchi.
C)tertiary bronchi.
D)bronchioles.
E)terminal bronchioles.

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The Answer of In the lower respiratory tract,cartilage plates first appear at the
A)primary bronchi.
B)secondary bronchi.
C)tertiary bronchi.
D)bronchioles.
E)terminal bronchioles.

In the Lower Respiratory Tract,cartilage Plates First Appear at the