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This loose confederation of Slavic territories, with its captial at Keiv, was ruled by the descendants of Vikings:

 The purpose of the Treaty of Verdun was to:

In the Battle of Hastings in 1066

According to the gate control theory of pain, factors like stress can

The lens of the eye contracting and expanding as a distance varies is a process called

Is this molecule likely to be:

Primogeniture was an inheritance system in which the oldest son inherits the title but the lands and wealth are divided among all of the children in a family.

25. Which of the following is/are an atom, an isotope and an ion?  

28. In a water molecule,  

45. .  The biological macromolecule that is least soluble in water is a(n):