Respiratory System - The Need for Oxygen

Science, Grade 9

Respiratory System - The Need for Oxygen

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1. Respiratory System - The Need for Oxygen
Lung cancer is common in smokers. Cancer occurs when pollutants cause a mutation, or change, in the lining of the bronchi. This change leads to an uncontrolled growth of abnormal cells, which can spread over many parts of the body and disrupt body functions.