Lots of points
which body system is used for calcium storage?
integumentary system
muscular system
skeletal system
cardiac muscular system

The skeletal system stores most of the body's calcium. The skeletal system includes bones and teeth. Small portions of  calcium are stored inside blood and muscles, yet they aren't used to store calcium. This means that the answer is C. Skeletal system.

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i would have a lunch. it's one big package of food, making it one food. : p

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme