CAIE A Level Biology 9700 · Control and coordination
When an animal encounters a sudden threat, such as a predator, both the nervous system and the endocrine system are activated. Explain how the nervous system and the endocrine system differ in their mechanisms of communication and the nature of their responses.
6 marks, so the mark scheme is looking for about 6 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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