Compléter Summary Unit 1 6ºVersion en ligne Complete the text. par Mariam Domingo 1 carbohydrates waste nutrients digestive respiratory balanced oxygen energy smoking absorption Nutrition provide us with and building materials . We obtain them from the in food . There are five groups of nutrients : , fats , proteins , water , minerals and vitamins . The digestive process takes places in the system . In includes digestion , of nutrients and elimination of . A complete and diet maintains a healthy digestive system . Respiration is the process by which we obtain the our body needs . It takes place in the system . Healthy respiratory habits include exercising regularly and avoiding .