In the genetic structure, which component changes when coding for different triplets and amino acids? A.) sugar
B.) phosphate group
C.) nitrogen base
D.) all three above will change in creating different triplets

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.