When david goes to graduate school, he wants to investigate aspects of the heredity–environment debate as it relates to human intelligence. he is most likely to:?

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.