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What is the correct order of the following steps in the progression of lung cancer in a smoker? 1. Cilia are lost. 2. There is a thickening and callusing of the cells lining the bronchi. 3. Metastasis occurs. 4. A tumor forms. 5. Cells with atypical nuclei appear.

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Answer:

The answer is given below in detail.

Explanation:

When a smoker continues smoking for years, the lungs develops cancer. The lung cancer progresses in the following order:

  1. The cell lining of the bronchi thickens and forms callus.
  2. After this step, cilia are lost
  3. Cells with atypical nuclei starts to appear
  4. After this tumor is formed
  5. In the final step, metastasis occur.

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