How atomic Mass can be compared with atomic mass of carbon?

Does promethium sink or float? Its name is derived from the Greek neos meaning new and didymos meaning twin? What organs store solid or liquid wastes? Name the methods of separating components what mixture oil and water iron and fillings water and alcohol petrol and kerosene camphor 7 common salt? Planet A Planet B Distance from Sun 0.72 AU 9.54 AU Planet composition rocky mantle iron core hydrogen helium Gases in atmosphere very dense atmosphere that is 96.5 poisonous carbon dioxide and 3.5 ni? Is a full ounce bigger than a pint? How can you decide whether a measurement is inaccurate and should be discarded? What is the difference between a Bunsen burner and a gas cooker hob? What directly causes mechanical motion? Is Dr. Pepper a mixture or solution? Is ribosomes the most common organelle in a cell? Enzymes work by lowering the what? Do wildcats live in the north or south pole? Who was the person to first walk on mars? Who are the most pretty girls in the world? Why every cell in your body contains the instructions to make every part of you but only a few instructions are used by each cell? What kind of lubricant is used for NPA? In atmosphere why there is no reaction of any action? What about oxygen makes you age? Does electronic rust proofing -- such as Counteract -- work to protect your car from rust?