When the president provides leadership on an important moral issue, he is acting as the nations

the answer is b your welcome : )

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

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i think a judge or jury, as they preside over the court and is the central figure in a trial.

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~ destiny ^_^