Most of the nutrients are soaked up by the small intestine through villi, I believe.
Bioavailability
Capillaries in Villi absorb all other nutrients except fat.
The system in the body that absorbs nutrients is the digestive system. Within the digestive system is the small intestine. When food passes through the small intestine, villi, absorb all of the nutrients the body needs from the food. Villi are small fingerlike projections in the small intestine that increase surface area and "reach" out to the food and absorb its nutrients. So, to answer your question, villi that are in the small intestine within the digestive system absorb what nutrients our body needs.
first
Iungs
They absorb their nutrients through their cell wall
Water helps the body to positively function by providing hydration of the cells.
so your body can break it down and your bones can absorb the nutrients
pancreas
Vitamin C/citric acid helps the body absorb iron.
This helps your body absorb the important nutrients in the food an helps to get rid of the waste
You digest your food so that your body can absorb all the nutrients in the food and poo wee wee