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an artificial heart was important because if someones heart was bad and they were dying, they could get an artificial one to replace the bad heart. Since they could they could replace the heart with an artificial one if heart transplant was not available, it maintained the population because the person with the bad heart didn't die

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the telephone made it easier to communicate from a distance without meeting in person. Since they could communicate from a distance,  it helped them when they were in trouble or just wanting to communicate with their family that is far away

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the thermometer made it easier to figure out if a person was sick because it showed if their temperature is high or low. Since they could figure out if someone was sick, they could find a solution to that sickness fast and cure it.

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The waterwheel used flowing water to turn that into useful forms of power.  The waterwheel made work easier because no one had to use full power to do other work because the waterwheel produced energy

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the iron-blade plow increased food production. This artifact created military dominance because we could produce iron weapons

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combining copper and tin to produce bronze was important because it made them be able to make weapons. Since they could make weapons, it was easier to kill animals, defend themselves from things, and it also helped them with other types of work.

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stone plows allowed people to garden easier instead of doing it by hand. Since  they could garden easier and faster, the crops wouldn't take an extra long time to be fully ready to grow and picked when they're done

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Fishing tackle allowed people to catch and kill the fish easier instead of using their hands. since they could kill the fish easier, they had an unlimited supply of the fish and they could live longer from the fish, and the vitamins in the fish

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The stone axe allowed people to kill animals easier than using their hands. Since they could kill animals easier, they had a more stable food supply, they lived longer and increased the population.