If you observed a cell under a microscope and noticed that it contained a plasma membrane, cell wall, and ribosomes, but none of the other organelles, what could you conclude ? a. it is a animal cell b. it is damaged c. it is an eukaryotic cell d. it is a prokaryotic cell

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.