Triple Biology revision (B3) 3.0 / 5 based on 1 rating ? BiologyRhythmsGCSEEdexcel Created by: zleiblingCreated on: 02-01-15 16:35 35421 Across 1. ? makes us feel sleepy (9) 5. a rhythm that lasts one day (9) Down 2. what does the rhythm monitor (chemical messangers) (8) 3. a timing mechanism in the brain (10, 5) 4. response to changing day length (14)
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