How are the landforms of the eastern united states and canada different from those of the western united states and canada

Which statement is a proper biconditional statement for the conditional statement: if a line intersects a line segment at its midpoint, then it is a segment bisector. if a line is a segment bisector, then it intersects the line segment at its midpoint. if a line does not intersect a line segment at its midpoint, then it is not a segment bisector. a line intersects a line segment at its midpoint if, and only if, it is a segment bisector. if a line is not a segment bisector, then it does not intersect the line segment at its midpoint.

The creation of the european union has had all of the following effects except

Acanyon on the ocean floor at which the crust bends downward is called a(n)