Answer:
the answer to that question is a civil war
She was born a slave but escaped. She lead hundreds of other slaves to freedom as well using the Underground Railroad (which wasn't an actual railroad, it was a system of secret routes and safe houses)
an experiment was designed to study the potential impact of alcohol consumption on emotional stability. a specification of how the dependent variable was measured is known as Operational definition
An operational definition is a precise, comprehensive definition of a measure that is used in data gathering. When gathering any kind of data, operational definitions are essential. When a choice is being made regarding whether something is correct or incorrect, or when a visual check is being performed when there is potential for mistake, it is very crucial.
Every time data is gathered, the method of collection must be specified. Undefined data typically has inconsistencies and produces incorrect results. Only a thorough operational definition that removes all uncertainty can guarantee consistent data gathering.
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D. Some powers are expressly given to the federal government under the constitution.