A-LevelBiologyGas exchange9700/12 · May/June 2017 · Q341 Mark
The diagram shows three types of cell found in the human gas exchange system. [Diagrams of three cell types labeled X, Y, Z] Apart from causing cancer, which cell types will be directly affected when a person is exposed to tar in cigarette smoke?
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AX, Y and Z
BX and Y only
CX and Z only
DY and Z only
✓ Correct answer
B: X and Y only
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