Describe how calcium may be used in the body

In case you don't know what Calcium Is:

a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions.

Calcium can be found:

Calcium is a soft white chemical element found in bones and teeth

Using the definition..calcium may be used in the human body by nerve conduction, heartbeat, muscle contraction, and many other physiological functions.

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answer; i believe that the correct answer is (a); a large rock being weathered by wind and rain;

i'm not sure

explanation:

i'll try whatever you got