Which of the following is a similarity between bryophytes and seedless vascular plants? They both alternate generations between gametophyte and sporophyte. They are both independent of water for reproduction. They both contain lignin. They both have no vascular tissues.

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.