The silk road was first used
a. during the yuan dynasty
b. under mongol rule
c. during the han dynasty
d. over 9,000 years ago

answer would be: C. during the Han dynasty

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44