Homeostasis refers to A. the effect of natural selection on human evolution.
B. a mixture or solution that is the same throughout.
C. the similarity of genetic traits to one another.
D. the tendency of a cell to maintain a stable internal environment.

How does the carbon cycle involve an exchange of carbon

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.

The image shows a group of fish. the type of social behavior shown in the image is called