Ressources:
"The Circulatory System." BBC News. BBC, n.d. Web. 13 Dec. 2015.
"Going for Gold." Wrapper. N.p., n.d. Web. 13 Dec. 2015.
"Gas Exchange." The Slow Loris. N.p., n.d. Web. 13 Dec. 2015.
"8th Digestive System." HSTE Project -. N.p., n.d. Web. 13 Dec. 2015.
(My class notes)