How has global trade been good for workers in developing nations?

your answer would be a) no nation can be economically self-sufficient.

stay in school!

there was a king, priests, and peasants.

to tell the truth it is a mix of the a and d because after the romans argued among themselves outside forces took control however it is mostly d.

the answer is a. the harappan civilisation is also called the indus valley civilisation, this is because they built their cities along the indus river. the reason behind this location can be found in the rest of the "old world" civilisations like mesopotamia or egypt, the first built their cities along the rivers tigris and euphrates, the second along the nil; : their respective civilisations thrived because the overflowing of their respective rivers produced favorable conditions for agriculture, their main support.