Put "Genetic Variation" in a sentence

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.

How do the evolutionary chart and the video support the claim that all living things are made up of cells?

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million