by 
Mawgan
ANSWERS: 4
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To keep the rest of it very simple. All the complicated bits - bridge, accommodation, engines, are in the block at the back. The rest is just a row of metal boxes which you fill with oil. That keeps the smelly, flammable oil as far away from people and flames as possible while still being part of the same ship.
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It has to do more with visibility. When these ships are in port, the captain or harbor pilot needs to be able to see as much of the ship as once. If he/she has to constantly be looking forward and aft, it would take twice as long to safetly leave/enter the harbor. Also, having all of the fuel resivoirs in one location makes it easier to load/unload. Last but not least, since the engine is in back and is heavier than the rest of the boat, it sits lower in the water and the people riding in that part of the ship don't have the sea swells as if they were on the bow.
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IT IS BECAUSE THEN THE CAPTIN CAN LOOK OVER THE SHIP AND IS ABLE TO THEN SEE THE WHOLE SHIP
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For the weight to help keep the propeller in the water in light ship conditions - when the tanks are empty.
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