
Master all modules with comprehensive notes, exam-style questions, and interactive flashcards aligned to the OCR H420 specification
Carbohydrates, lipids, proteins, nucleic acids, and water
Gas exchange in insects, fish, and mammals
Circulatory systems, blood vessels, and the heart
Pathogens, disease transmission, and immune response
Classification, evolution, and maintaining biodiversity
Nervous system, hormones, and homeostatic control
Photosynthesis, respiration, and ATP
DNA, genes, inheritance, and genetic engineering
Energy flow, nutrient cycles, and succession
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