Early civilizations of the Indus Valley: had clever city planners
had weak governments and strong armies
declined mainly due to natural disasters
had thriving farms that allowed job specialization
had strong central governments
and were relatively sophisticated

It is reasonable to assume that nations with a low total fertility rate (tfr) and a modest amount of population growth are in

Air masses are characterized by various properties including temperature humidity air temperature pressure and wind speed . which of the following air masses is associated with low relative humidity and high temperature

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.