SELECT ALL THAT APPLY, MEANING MULTIPLE ANSWERS Which of the following were characteristics of the Indus Valley cities?

streets ran parallel to one another
bricks were used in buildings
they were heavily guarded
they had sanitation systems
they were planned in advance
the Aryans built them

Ifound this on google “the existence of agglomeration economies is central to the explanation of how cities increase in size and population, which places the phenomenon on a larger scale. the concentration of economic activity in cities is one reason for their development and growth.” i hope this you for what your looking for.