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B1 Revision
Q: What are the ranks in the classification system? (List in order)
Q: Describe the main symptoms of sickle cell disease. (3)
Q: Using your knowledge of natural selection, suggest why the dodo may have
become extinct. (3)
Q: Describe the causes of variation in a population. (2)
Explain how stimulants affect neurotransmission. (3)
