What is chemistry and what types of questions chemist try to answer

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

Which of the following is a common response to cell signaling?

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.