They contain Carbon, Nitrogen, Hydrogen, Oxygen, and Sulfur
<h3>Ferric Oxide:-</h3>


<h3><u>C</u><u>a</u><u>l</u><u>c</u><u>i</u><u>u</u><u>m</u><u> </u><u>H</u><u>y</u><u>d</u><u>r</u><u>o</u><u>x</u><u>i</u><u>d</u><u>e</u><u>:</u><u>-</u></h3>


<span>The amount of exercise that a person gets would be the independent variable, as it would impact the amount of time it would take to run the kilometer, with time being the dependent variable.</span>
That answer is what characteristic you have.