Which of the following macromolecules contain nitrogen? O A. Lipids
B. Carbohydrates
C. Proteins
D. Vitamins

proteins contain nitrogen

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.