This course offers a wide range of biological principles from the microscopic structure of cells and the biochemistry within them to the interdependence of organisms in their environments. The Salter-Nuffield Biology course has a context-led approach. Topics are based on a storyline or contemporary issue such as risk and cardiovascular disease, rather than being based on themes like cell structure. Biological principles are introduced when required to aid understanding of the context enabling students to make links between different areas of biology and supporting the development of a bigger picture. There are also around 20 practical investigations to support understanding of key concepts, these practicals make up a proportion of the examinations.