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How good or bad (in terms of pollution) the air is, is rated by a color-coded ________ Index.
Thoracic Cavity
The part of the body located between the neck and the abdomen that houses organs such as the heart and lungs.
Mucus-Secreting Cells
Specialized cells found in various parts of the body that produce and release mucus, which serves protective and lubricating functions.
Bronchial Tree
A series of tubes that begins where the distal end of the trachea branches.
Pharynx
The muscular tube that connects the mouth and nasal passages with the esophagus and larynx, involved in breathing, swallowing, and speaking.
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