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We think that boats came first, because any simple design could be used equally to the boats we know today. It could simply be a large piece of wood, or log. It would still be considered as a boat.

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We think that the wheel was invented second, to make travel easier. They could use wheels for carrying things, or simply just putting wheels under a piece of wood, and place their things on it. It would make things much easier to move

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We think that horses came third because they were here before us and it was one of the most basic forms of travel. The year also suggests/proves our point.

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We think that roads come in next as so it would be easier for horses to travel

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Carts probably came next. While wheels have already been invented, people would have to find a way to make carrying things easier. So the simple solution would just be to put wheels on something that could hold things, to make it easier for us to carry them.

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Early trains were slow and steam powered. We think that it came before cars and buses because of the year. Trains soon developed into our modern subway and trains

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Bicycles are one of the easiest transports to not only learn, but to drive through small alleys, or simply to ride down the pathway. It's simple yet useful, so it would be no surprise for the bicycle to be invented.

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The first busses used horses to move.

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Cars were invented later because they needed an internal combustion engine. A steam engine would be to big.

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We think that planes were only invented just 100 years ago due to that fact that it takes modern technology or good materials that you can only find 100 years ago.