Use the drop-down menus to complete each sentence.

A CONSUMER is an organism that eats other organisms to gain energy; it is also called HETEROTROPH.

A PRODUCER is an organism that makes its own food; it is also called AUTOTROPH.

A DECOMPOSER is an organism that breaks down waste and dead organisms.

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.