a 20.8-g sample of fuel is burned in the presence of oxygen as a result 9.8 grams of carbon dioxide and 17.3 grams of water are produced and captured in containers. According to the law of conservation of matter how much oxygen reacted with the fuel.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

d. planting trees

the trees take in carbon to make oxygen.

they dont have any evidence