Check my answers . q. which of these skin cancers is most likely to spread to other parts of the body without early treatment? a. basal cell carcinoma b. squamous cell carcinoma c. melanoma d. basal cell carcinoma and melanoma q. what happens when the keratin- producing cells of the skin die? a. melanin and keratin are produced b. an additional dermis layer is formed c. a waterproof coating is formed d. melanin is produced

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.