B4 12 using anaerobic respiration B4 11 anaerobic respiration B4 06-2 h investigating osmosis B4 10 aerobic respiration OCR-B4 04 energy from the sun B4 03 enzymes and temperature B4 08 photosynthesis- rate-limiting factors B4 07-nitrates and active transport OCR-B4 01 living processes OCR-B4-Lesson 2 enzymes and pH 
