Help on Study Island! The planet Jupiter is composed of

A. liquid metals with a thin atmosphere of oxygen gas.

B. solid hydrogen and helium ice from the surface to the core.

C. a small rocky core surrounded by a thick atmosphere of dense gases.

D. a liquid water core surrounded by a surface of heavy rock.

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.