proteins. approximately 50% but then again it depends on all else is added in the burger.
I believe its Iron.
Chicken generally contain large amounts of protein.
Patty and bun.
carbohydrates
It has love.
hamburger
There is a nutrient found in only a few vegetables that you can find no where else.
A nutrient found naturally in many foods would be a mineral, just in general.
oxygen
The major site of nutrient absorption is the small intestine.
sugar
starch