You should seriously consider including the answer choices.
The correct answer is active transport. Active transport entails movement of substances against a concentration gradient and requires use of energy in form of ATP and use of protein pumps. Active transport is used to enhance several activities in the body such as movement of nutrients from the small intestines to the blood stream, this ensures that all the nutrients have moved from the lumen,
I believe lactic acid fermentation is used for all three!
Answer:
The substance taken in is mineral salts.
