Relationship where one benefits and the other is unaffected

Francine, a college freshman, has agreed to participate in a psychology research study. before she begins her participation, she reads a statement written by the researcher explaining the purpose of the research and the potential risks of participation. it also explains that francine is free to withdraw from the research at any time. in providing francine with this statement, the researcher has followed the ethical guidelines of for participants.

Why did the use of african slaves increase in the americans during the 1500s

What does the ricardian theory state? a. countries should produce all goods and services if they canb. countries should not produce goods and services that minimize opportunity costsc. countries should import goods and services if they are cheaper in other countriesd. countries should export all goods and services if they make a profit