Asubstance that moves across a cell membrane
without using the cell's energy tends to move

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

What feature of cell theory is best demonstrated in the image

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?