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Why did lincoln inform the confederacy that he would not e sending troops or weapons as food supplies were sent to fort sumter?

Which term describes a possible explanation of, or answer to, a scientific question that is based on prior knowledge or research and that is testable?

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?