La cantidad demandada por el producto A aumenta un 8% cuando el precio del producto B aumenta 16% y las demás variables se quedan igual.

6, 4, 5, 1 are true. the others are false.

The correct answer is a. when they started making tools that will them in cultivating lands, they could raise crops and that made them attached to one place for a longer period of time. after that, they started domesticating animals and building their own permanent settlements that resemble the ones we have today.