1) http://www.tvdsb.on.ca/westmin/science/sbi3a1/digest/digdiag.htm
2) http://www.kidshealth.org/misc/movie/bodybasics/digestive_system.html
3) http://www.imcpl.org/kids/guides/health/digestivesystem.html
4) http://www.constipationadvice.co.uk/constipation/digestive_system.html
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