The diagram shows three types of cell found in the human gas exchange system.
Apart from causing cancer, which cell types will be directly affected when a person is exposed to tar in cigarette smoke?

1 )
X, Y and Z
X and Y only
3 )
X and Z only
4 )
Y and Z only
تحلیل ویدئویی تست
تحلیل ویدئویی برای این تست ثبت نشده است!