This is two or more equations with common variables, also known as a linear system. System Of Equations
Nuclear fear led to a new market for fallout shelters. Home economics classes taught girls how to stock such a shelter with food and supplies in the event of a nuclear attack. The government created official films on shelters, praising their value and advising homeowners on how to use them.
Answer: Dual Federalism
Explanation: Dual Federalism is a theory which distributes power between the federal and the state governments. It argues for both the federal and the state governments to have authority and responsibility over individuals, although to different extents. In this form of federalism the federal government exerts its authority over such matters as the military and foreign affairs while the state government should be responsible for welfare and safety.
Dual Federalism was the system of interpreting the constitution between 1789 to about 1937.
Answer:
The earliest known life-forms are putative fossilized microorganisms, found in hydrothermal vent precipitates, that may have lived as early as 4.28 Gya (billion years ago), relatively soon after the oceans formed 4.41 Gya, and not long after the formation of the Earth 4.54 Gya
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