Digestive System References

1. The human digestive system. (2019, April 17). Retrieved June 14, 2020, from https://www.natgeokids.com/uk/discover/science/general-science/your-digestive-system/

2.    Digestive System Facts for Kids - Stomach, Intestines, Saliva, Esophagus. (n.d.). Retrieved June 14, 2020, fromhttps://www.sciencekids.co.nz/sciencefacts/humanbody/digestivesystem.html