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body systems
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nervous system
immune system
muscular system
skeletal system
circulatory system
respiratory system
integumentary system
excretory system
digestive System
endocrine system
Bibliography
Bibliography
http://www.mananatomy.com/body-systems/muscular-system
http://www.biology4kids.com/excretory system
http://www.bodysystems.com/circultory system
www.livescience.com
Www.kidshealth.com