These two theories are related because they are continuity from one another. The theory of plate tectonics insinuates that the crust layer is broken into multiple pieces, this is caused by the pressure of the mantle layer, which managed to break the crust where it is thinner. The theory of continental drift insinuates that the tectonic plates move around the Earth because of the pressure from the hot semi-liquid mantle layer.
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I'm not sure i can understand that passage
D. this is because when someone shows you a model of a cell, it is a diagram (typically) showing you the composition of it so that you can get a better idea of what the cell is and what the cell does.