Which step should the student perform next to complete the construction

The continental divide a divides the united states into east and west b. divides the united states into north and south c. divides the flow of river systems in the united states into east and west d. is a series of rivers and mountains that separates canada from the united states select the best answer from the choices provided.

Evaporite rocks te more permeable than reef rocks true false

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4