What new technology allowed the Tigris and Euphrates rivers to become the first area in the world where civilizations could grow?

Irrigation systems

Explanation:

The advent of irrigation allowed nomadic societies to draw water from the Euphrates and Tigris to their fields and to settle into agricultural communities. by easily transporting water to their fields, they could benefit from the life-giving floods from both rivers and not have to worry food security that comes from a nomadic lifestyle

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.

you can't, there's no way sorry