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Biology

www.bbc.co.uk/schools/gcsebitesize/biology
This site has six topic areas: Ecology, Humans, Inheritance, Plants, Processes and Variation.  As you go into each one there are lists of sub topics. For example clicking on Inheritances will take you to sub topics such as Dominant and Recessive Genes.  

www.s-cool.co.uk
covers the same topic areas but uses slightly different headings.  

www.samlearning.com
users can access revision material and exam papers.
Log on to SAM Learning using the password supplied by your school.  

www.biotopics.co.uk