Select all that apply. which were used by the ancient olmecs? rubber jade artwork river dams ceramic technology basketball a drainage system a calendar

The answers are rubber,  jade artwork,  ceramic technology, a drainage system, and a calendar.

Hope this helps:D

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

answer; i believe that the correct answer is (chronological order);