A grade answer written by a teacher in line with AQA mark schemes, specification and approved textbooks.
AO1 = Explanation of the 24 hour sleep/wake cycle including endogenous pacemakers e.g. the SCN and exogenous zeitgebers e.g. light
AO3 = Balance of strengths and limitations relating to supporting research evidence, methodological issues, generalisability and practical application.
Approximately one page long to reflect the amount a student can write under exam conditions.
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