Which statement is completely accurate?
atoms of the same element always have different numbers of neutrons.

atoms of the same element can have different numbers of neutrons.

atoms of the same element always have different atomic weights.

atoms of the same element can have neutrons but exist without protons.

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls