The group that receives the treatment or test stimulus or factor under study is called the

Why do drivers have difficulty seeing side traffic at t-intersections in rural areas?

What was the greatest contribution of the “scientific method”?

Which statement is correct? the speed of the light ray is the same in air and medium a. the speed of the light ray is the same in air and medium b. medium a and medium b have different densities because light refracts at different angles. medium a and medium b have the same density because the light ray strikes both at the same angle.