What new invention made the sea safer for sailors? Please Help... I'm doing an assignment and i need someone to help me .

Francine, a college freshman, has agreed to participate in a psychology research study. before she begins her participation, she reads a statement written by the researcher explaining the purpose of the research and the potential risks of participation. it also explains that francine is free to withdraw from the research at any time. in providing francine with this statement, the researcher has followed the ethical guidelines of for participants.

Which statement describes a major advantage of a unitary system of government over a confederal system

How much power did popes have in the middle ages