Two atoms are isotopes of the same element, the atoms must have

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests.which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory