Baby nicholas watches as his mother leaves the room, but he does not cry because he understands that his mother still exists even though he cannot see her. this is an example of which reaction concept

Object Permanence

Explanation:

Object Permanence is applied to explain a child's capacity to know objects proceed to remain even though they can no longer be seen or heard. This is developmental psychology, that examines the improvement of young children's social and mental capabilities. Jean Piaget, was first to study object permanence in children, explained that it is a child's most significant achievements, without this theory, objects would have no difference. Peek-a-boo is one of an example of an object permanence test.      

yes                                            

explanation:

just cause                            

answer; ///( no)   they would be tried separate,criminal cases would be tried first, then the civil case;