The \u201cknee-jerk\' motion that people involuntarily perform after being struck in the knee in a certain way is an example of what kind of behavior?

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.