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9 marksRespiration

CSEC Biology · January 2017 · Paper 2 · Question 4(a)

Describe how oxygen in the atmosphere becomes available to human blood for delivery to the cells, and explain how this process differs from the way plant cells obtain oxygen for respiration.

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  1. 4(b)Suggest SIX reasons why humans who smoke heavily have less oxygen available to the cells for respiration.[6 marks]

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