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Experimental designs establish cause and effect. This is done through manipulation of the independent variable (IV) to see the effect on the dependent variable (DV). Correlations cannot establish cause an...

This tense, now used much less than in the past, is utilised in the following cases:1) To exhort someone to do something, instead of using the "imperativo"("Faccia pure come vuole!", ,...

Price elasticity of demand (PED) is a measure of the % change in demand of a good which occurs in response to a change in price.There are four main factors which effect PED:availability of substitutes - i...

In questions involving hyperbolic functions and natural logs, it is often useful to rewrite things in terms of e, since then you might be able to take a natural log at the end of your answer. Here, we can...

Questions about speciation are at their core based on Darwin's theory of evolution. As a result, we must recall GCSE knowledge of natural selection to combine with the new concepts in speciation introduce...