Examlex
How many different constitutional isomers are there with the molecular formula C2H4Br2?
Defined
Clearly characterized or determined; having a clear definition or boundary.
Atlantic Slave Trade
The transatlantic trading of African people, primarily to the Americas, where they were sold as slaves from the 16th to the 19th centuries, a key part of the triangular trade.
Forefront
The leading or most important position or place, often used in the context of being at the forefront of a particular field or movement.
Movement
An act of changing physical location or position or of having this changed.
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