Anyone need help with any grade 7 and below any subject

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

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.

In what part of the body does the most muscle activity happen?