Answer:
C. Concentration gradient
Answer:
Nutrients get absorbed as the food is broken down, with the majority of nutrients being absorbed in the small intestine, where they're then transported into the blood stream
Explanation:
The Use of nitrogen fertilizers near the lake is your answer.
Water because the others are to complex to be diffused with out being digested but water can be diffused as if.
Those would be enzymes I believe. They are the power house of the membrane and lower the amount of activation energy needed.
