What factor is not a part of the highway transportation system?

Ineed an answer for this one (number 8)

Where in the united states does roman catholicism dominate? a.southern new england b.southwest c.pacific northwest d.southeast e. a & b only

Professor king finds out that the results of her study on visual and auditory stimuli and activity in the right hemisphere of the brain are statistically significant. what does it mean when the results of a study are statistically significant?