According to this excerpt why was the act necessary?

What are new social classes emerged due to advancement in agriculture ?

The military dictatorship inviolently reacted to the opposition of the maya, who demanded greater rights for their native population. the genocide inresulted from a struggle between arab nomadic tribes and non-arab agricultural groups. the tutsi were the victims of genocide inat the hands of the hutu rulers.

The largest formal unit of geologic time is