[by Robert Hoskin (]{style=“font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;”}[University of Sheffield, UK)]{style=“font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;”} [Short-listed for Access to Understanding 2013]{style=“font-family: "arial";”} [To what extent do biological and environmental factors influence how an organism develops?