Part 1 Living cells: structure and function of cells; diffusion and osmosis; enzyme action; respiration; photosynthesis. Part 2 Environmental biology and genetics: energy flow; factors affecting the variety of species in an ecosystem; factors affecting variety in a species; genotype and phenotype; applied genetics. Part 3 Animal physiology: mammalian nutrition; control of internal environment; circulation and gas exchange; blood; the brain and nervous system.
