During the Mongol rule in China, what Chinese inventions were brought back home with European traders? A.
silver, spices, and cotton
B.
steel, compass, and gunpowder
C.
tea and silk
D.
silver, spices, cotton, tea and silk

Identify the example of when situation and time are key to assessing risk of harm in a research study: a study on the efficacy of a behavioral intervention for smoking cessation involves both adults and teenagersasking women if they have had an abortionresearch on the prevalence of hiv-infected individuals in communitiesa survey about sexually transmitted diseases