endorsed foredexcelEdexcel AS/A levelBIOLOGY B1Ann FullickALWAYS LEARNINGPEARSONPublished by Pearson Education Limited.80 Strand.London WC2R ORLwww.pearsonschoolsandfecolleges.co.ukCopies of official specifications for all Edexcel qualifications may be found on the website:www.edexcel.comText©Ann FullickExam-style questions Pearson Education LimitedEdited by Natalie Bayne and Jo egreDesigned by Elizabeth Amoux for Pearson Education LimitedTypeset by Tech-Set Ltd.GatesheadOriginal illustrations Pearson Education Limited 2015Illustrated by Tech-Set Ltd,Gateshead and Peter Bull Art StudioCover design by Elizabeth Arnoux for Pearson Education LimitedPicture research by Caitlin SwainCover photo/illustration Science Photo Library/King's College LondonThe rights of Ann Fullick and Graham Hartland to be identified as authors of this work have been assertedby them in accordance with the Copyright,Designs and Patents Act 1988.First published 2008Second edition published 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