Which structure is a part of the respiratory system? A. skin B. ears C. eyes D. nose

D.nose

Explanation:

Logic comes handy here you breathe by your nose

You inhale and outhale there

Hope I helped

Nose

Explanation:

Our nose is part of our respiratory system because it absorbs air to our lungs.

There are 3 major parts of the respiratory system: the airway, the lungs, and the muscles of respiration. The airway, which includes the nose, mouth, pharynx, larynx, trachea, bronchi, and bronchioles, carries air between the lungs and the body's exterior.

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there