Part 1 Life processes and cells: cells and tissues; into and out of cells; enzymes. Part 2 Humans as organisms: food and digestion; breathing and respiration; blood and circulation; homeostasis; nervous system; support and movement; reproduction and growth; health. Part 3 Plants as organisms: feeding in plants; transport and water relations; plant reproduction and growth. Part 4 Variation, inheritance, evolution and biotechnology: variation; inheritance; evolution; biotechnology. Part 5 Living things and their environment: adaptation and competition; energy transfer; nutrient cycling.