Slaves from africa where brought to the americas to mine and work in farms
Poor air and water quality, insufficient water availability, waste-disposal problems, and high energy consumption are exacerbated by the increasing population density and demands of urban environments. Strong city planning will be essential in managing these and other difficulties as the world's urban areas swell.
<span>they all are positive numbers
they all are real numbers
they are all whole numbers
none of them are multiples of 3 </span>
