Amodern sprinkler system has a function similar to which structures built by early river valley civilizations?
a) canals.
b)pyramids.
c) walls.
d)hospitals

How did people in the 14th century understand black death

The most important units of the english armies which fought during the hindred years war were composed of

Deu 6. the federal reserve system to regulate (1) the annual federal budget (2) state sales tax rates (3) social security payments (4) the nation's money supply . .the codoral reserve system