| PLoS Biology |
| PLoS Biology is a peer-reviewed, open-access journal published by the Public Library of Science (PLoS), a non-profit organization committed to making ... |
| http://biology.plosjournals.org/perlserv?request=index-html&issn=1545-7885 |
| BBC - GCSE Bitesize - Science: Biology |
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| http://www.bbc.co.uk/schools/gcsebitesize/biology/ |
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