To calculate the speed of wave, what two pieces of information do you need about the wave ? help asap plz i’m being timed!!!

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

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.

Resperation is a way to release carbon back into the atmosphere