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The most common directly preserved fossils are unaltered hard parts of a living organism, like shells, teeth, and bones. ... After the remains of an organism have been buried and cemented within sediment, water percolating through the sediment leaches out the fossil. This leaves a cavity in the rock, called a mold.
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Explanation:The simple presence of railroads could bring a city economic prosperity. Railroads even helped shape the physical growth of cities and towns, as steam railroads and then electric street railways facilitated growth along their lines and made suburban living feasible.
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I don't know the answer to the first one, but the next two are New England and Connect with Nature
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The Belgium people fought against the Germans, slowing them down. English and French troops had time to mobilize.
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If the germans ha anticipated the fight with the belgiums or made the time back up perhaps.
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the heat of the Sahara made them move east and North
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it s end u r African