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When considering what is needed of any a level essay question, the best place to start is the mark scheme for past papers. These mark schemes give a consise explanation of what is needed to acheive top marks...

Mitosis is the cell division that produces 2 daughter cells with genetically identicle DNA to the parent cell. These are none as diploid cells. Meiosis requires two stages of cell division to produce 4 daugh...

It may seem like a stupid question, but how do you learn a book?<o:p></o:p> The best advice I can give is the following........<o:p></o:p> 1) READ IT! Ideally you should read it once ...

A common yet frustrating issue that examiners find with essays under exam conditions is that the candidate fails to answer the question to the desired level. This may be due to a misinterpretation of the que...

Simultaneous equations - Solution by substitution As the variables (x & y) are the same in both equations , we can substitute from one equation into the other. This will give an equation with just one va...