Final answer:
When Actus Reus and Mens Rea come together, it is called concurrence of elements, signifying the presence of both the physical act of committing a crime and the necessary guilty state of mind.
Step-by-step explanation:
When Actus Reus and Mens Rea come together in criminal law, it is called concurrence of elements. The term Actus Reus refers to the physical act of committing a crime, while Mens Rea is the mental state of the accused at the time of the crime, implying intent or knowledge of wrongdoing. Together, they form the basic elements required to establish the defendant's guilt in a criminal case. It is only when these two components coincide that an individual may be held fully accountable under criminal law for unlawful actions.