D. veto 1.
a constitutional right to reject a decision or proposal made by a law-making body.
Drinking water and fish I believe
The last country to abolish slavery (in the Western world) was Brazil. It abolished slavery in 1888, by the time that almost 4 million slaves were transported from Africa to Brazil.
In the whole world, Mauritania was the last country to abolish slavery.
I think because of the climate of the Paleolithic era only certain plants to grow their and only certain animals lived in the era