Answer:
printing, gunpowder, wheelbarrow
Explanation:
printing has made a huge impact on everybody around the world because it's a new way to get things across it's a huge help in school and we print our money that would be a huge setback if we didn't have printing. gunpowder was used for big wars what we do without guns and wars and the army and Navy and big groups of people that fought for our country. mobile is has a huge impact because it's a easy way to carry big loads of stuff and there's really no other way to do that farms use it a lot for garden work and just way easier and it would have been way more difficult without the wheelbarrow.
