Fancy a career in medicine, physiotherapy, archaeology, disease, animal interaction and behaviour, nature or sport science? Then A-level biology is for you! The skills you will acquire will be essential in understanding how your mind and body interact with the natural world throughout your life. There are 7 trillion cells in your body making up 200 different cell types that react to every movement, stimulation, message or threat in order to keep yourself alive. Put simply, biology is the scientific study of life, as such it encompasses the investigation of living organisms and life processes from the molecular, through cells and individual organisms to populations and whole communities of animals and plants.