In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. The researcher can operationalize (i.e. define) the variables being studied so they can be objectivity measured.
The element acid found is Nitrogen
"Carbon, because it can bond with many elements to form complex molecules" is the element that <span>is considered the most versatile element in living organisms. The correct option among all the options that are given in the question is the third option or the penultimate option. I hope it helps you.</span>
Please state the options / choices so that we can answer your question. Thank you.