Biology past papers › 9700/21/O/N/25

9700/21/O/N/25 Question 2

Biology October/November 2025 Paper 21 · 12 marks · Haemoglobin, Oxygen dissociation curve, Arteries, veins and capillaries, Cardiac cycle

Mark scheme

Question 1 · Question 3

Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.