List the hierarchy or ranking of laws in the u. s., and explain why it's important that we have this hierarchy/ranking at all

Frequently, two expressways that intersect will be connected by a . a. cloverleaf interchange b. diamond interchange c. trumpet interchange

During bad weather, you should travel_the posted speed limit.

Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience. b. report the adverse drug experience to the irb only if there are several other occurrences. c. report the adverse drug experience as part of the continuing review report. d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb