Answer:
A
Explanation: An ellipse is a shape that resembles a flattened circle. How much the circle is flattened is expressed by its eccentricity. The eccentricity is a number between 0 and 1. It is zero for a perfect circle.
Answer:
A unitary government is one in which all the powers of administration are vested in a single centre
Explanation:
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An ethnic genocide, for one.
This means that a certain ethnic group was basically wiped out in that country/state. In the Holocaust, it was the Jews.
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It was Alexander the Great of Macedonia who conquered Persia in the 330s BC, in what became known as one of the most significant takeovers in history, since it led to the fall of the Persian Empire.