Relier Pairs Natural ScienceVersion en ligne Vocabulary par Marta Castaño 1 It gives us the oxygen we need to live 2 The heart pumps blood 3 We breathe air through our nose 4 the food goes to the stomach 5 It carries oxygen in the blood 6 Our teeth chew the food in the mouth It's a digestive system It's a respiratory system It's the respiratory system It's a circulatory system It's the digestive system It's the circulatory system