Is glass biotic or abiotic factor?

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

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.

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity