27. The Roman emperor Constantine issued the Edict of Milan: A which legalized Christianity in the Roman Empire. B which allowed for absolute freedom of religion in Rome. C which prohibited public displays of religion throughout the Empire. D which promised rewards to anyone turning in a practicing Christian to Roman authorities.

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.

sonar maybe? ? i dont know the choices