Serving as the presiding officer of the U. S Senate is a constitutional (formal) duty of the?

Which of the following is a true statement:

A

The five oceans are completely separated from one another by continents.

B

The great ocean conveyer belt is powered by wind, tides, Earth's rotation, the sun and differences in water density.

C

It takes less than 1 year for the great ocean conveyer belt to complete one cycle.

D

The Arctic Ocean is the only ocean not connect to any other ocean.

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

whose power in the senate is equal to the power of the speaker of the house?