Which of the fallowing structures is built to protect boats from large breaking waves?

jetty

groin

breakwater

seawall

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

What drives the atp synthase reactions that produce atp

The scientific method is limited to investigating physical phenomena that are which of the following? select all that apply. observable repeatable falsifiable unique measurable