Which economic system do most countries operate under today?

Which of the following farming methods the inca farm the hillsides a) slash- and- burn b) crop rotation c) irrigation canalsd) dam construction

What major land feature is located at 0* and 20* e? a sahara desert b kalahara desert c congo basin d the alps

Which phrase best fits in the blank box? wasted government money gave citizens government money encouraged people to vote supported government investigations