D: smoking cigarettes
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Where does the placenta allow the exchange of materials to take place between mother and fetus?
Which sequence shows the shortest route taken by blood travelling from a leg to an arm in the human body?
Table 2.1 shows the volume of blood supplied to parts of the body at rest and during strenuous exercise. Table 2.1 vo…
Amylase solution is tested with Benedict's solution, biuret solution and iodine solution. Which colours are obtained?
What shows how the rate of transpiration changes when conditions in the atmosphere change?
What is the main cause of water moving up to the leaves in xylem vessels?