By Van Geyte, Els
By Aish, Fiona, Tomlinson, Jo
By Anneli Williams
By Peck, John, Coyle, Martin
By Dr Catherine Dawson
By Andrew Eynon
By Pauline Smith
By CGP Books
By Mcmillan, Dr Kathleen, Weyers, Dr Jonathan, Jonathan, Kathleen
By Ron Fry
By Kate Williams
By B. Greetham
By Su Nicholson, Russell Timmins, Greg Byrd
By Godfrey, Jeanne
By Peter Levin
By CGP Books, CGP Books
By Steve Bowkett
By Cottrell, Stella
By D. Rayner, Rayner, D.
By Iain Valentine, Leckie
By Drew, Sue, Bingham, Rosie, Sue Drew, Rosie Bingham
By Conrad Lashley, Warwick Best
By Jeanne Godfrey
By Pears, Richard, Shields, Graham
By Letts Cambridge IGCSE
By Steven Jones
By Pauline Millican (Faculty of Biological Sciences, University of Leeds, UK), John Heritage (Faculty of Biological Sciences