Which statements correctly describe characteristics of cells? Check all that apply.

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.

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.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.