During the Middle Ages, the Chinese used ____________________ to ...

[newbem]

During the Middle Ages, the Chinese used ___________________ _ to control pests on crops.
 
  Fill in the blank(s) with correct word

Question 2

As far back as 200 B.C., the Romans used an asphalt-like mixture called ___________________ _ to control insects in vineyards.
 
  Fill in the blank(s) with correct word

[steff9894]

Answer to Question 1

arsenic

Answer to Question 2

bitumen

[newbem]

Excellent

[cam1229]

Thanks for the timely response, appreciate it