Introducing additional organisms of the same existing kinds will not upset the ecosystem.
true or false

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

Identify the examples in which sam interacts only with natural resources

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.