What is the dependent and independent variable of my science fair project?

I will find out if dark green vegetables have more vitamin c than light green vegetables. I will have two dark green vegetables (Broccoli, Spinach) and two light green vegetables (Iceburg lettuce, cabbage) and see which on has more vitamin c. What are the constants, control group, independent, and dependent variable? If you need more info i will tell you more|||independent: type of vegetable

dependent: amount of vitamin c

control group: maybe a vegetable that is in the middle of light and dark

constants: size of vegetables (probably measure out by the oz), organic veggies



added: what are you measuring? That would be your dependent variable -a measurable result.