Looking at the map, if you were a prehistoric person traveling from north to south america, what route would you take?

The following are sumerian inventions, except

When were the first 10 amendments to the constitution adopted and what was their purpose? when were the first 10 amendments to the constitution adopted and what was their purpose?

An object weighs 40n in air , weighs 20n when submerged jn water and 30n submerged in a liquid of unknown density .what is the density of the liquid?