CAIE A Level Biology 9700 · Biological molecules
During intense exercise, a mammal produces sweat, which evaporates from the skin, cooling the body. Explain how the hydrogen bonding between water molecules is responsible for water's high latent heat of vaporisation, and how this property enables sweating to cool the body.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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