Which of the following was a key factor in the popularity of the cotton gin? O It sped up cotton production
O It was lightweight and easily carried into the fields
O It ran off electricity
O It was designed by Eli Whitney

The evolution from apes to modern humans involved many bodily changes

Which four of these developments were made under mongol rule during the pax mongolica? the extension of the grand canal in china the spread of christianity the spread of weapons that used gun powder the invention of new medicines the establishment of a postal system the invention of geometric models of lunar motion

Which events are correlated but do not necessarily have a causal relationship?