What are some "nonliving characteristics" of viruses? a. they are non-cellular

b. they do not need energy

c. they can be crystallized and stored indefinitely, yet still infect a host cell if presented to it.

d. all of the above

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.