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Explain how changes in agriculture may have contributed to global temperature changes.

Modern agriculture contributes to an increase in global temperatures through the release of greenhouse gases into the atmosphere. Greenhouse gases (such as carbon dioxide and methane) contribute to the green...
Answered by • Geography tutor
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Explain the relative resistance to bromination of benzene compared with alkenes.

Benzene has a delocalised pi system in which p orbitals of all carbon atoms overlap above and below the carbon ring. Alkenes, however, have localised pi-orbital overlaps between two carbon atoms. The electro...
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Answered by Jasmine W. • Chemistry tutor
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Distinguish between external sovereignty and internal sovereignty

Sovereignty is the principle of supreme and unquestionable authority, reflected in the claim by the state to be the sole author of laws within its territory. Definition of external vs. internal sovereignty I...
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To what extent was the United States responsible for the collapse of the Grand Alliance at the end of the Second World War?

In writing this essay, the first thing to note is the structure of the question – ‘to what extent’ – this means that the essay will have to have two sides and deal both with the United States and the Soviet ...
Answered by • History tutor
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Explain how a stack could be used in the process of evaluating an expression in Reverse Polish notation.

Starting at the left hand side of the expression push values onto stack. Each time operator reached in the expression pop the top two values off the stack and apply the operator to them, then push the new va...
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Answered by Ellie F. • Computing tutor
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