The graph presents the findings of a study designed to find out whether a relationship exists between the number of cigarettes smoked by a mother and the birth weight of her baby. Which conclusions may be made from this graph? 1 As the number of cigarettes smoked rises, the baby's weight always falls. 2 Other factors besides smoking influence a baby's birth weight. 3 Nicotine, tar and carbon monoxide reduce the growth of an unborn baby. 4 Most smokers smoke between 10 and 35 cigarettes per day.
- A1, 2 and 3
- B2, 3 and 4
- C2 only
- D3 only