Mechanical churning of food in what organ serves to further break it apart and expose more of its surface area to digestive juices, creating an acidic \u201csoup\u201d called chyme?

The four Science Regents exams (Earth Science, Living Environment, Chemistry, and Physics) also include separately-scheduled lab practicals.
In New York, students have the opportunity to take Regents Exams in grades 9-12 and, when appropriate, in grade eight.