a. http://www.cyh.com/HealthTopics/HealthTopicDetailsKids.aspx?p=335&np=152&id=2910
b. https://kidshealth.org/en/kids/digestive-system.html
c. http://www.cyh.com/HealthTopics/HealthTopicDetailsKids.aspx?p=335&np=152&id=1446
d. https://prezi.com/f5px2qf087sm/how-to-take-care-of-your-body-systems/
e. http://kidshealth.org/en/kids/bones.html
f. https://kidshealth.org/en/kids/stay-healthy/
