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It is important to use quotations in your essays as evidence for a point you are making. Use 'PQO' to remember the important steps you must adhere to when writing an essay. 

Point - make ...

The process of diffusion is extremely important for the uptake of substances into cells. These substances can be very important for a whole range of cellular processes. Its also useful in reomoving waste ...

Although these two words can be used interchangably they are very very different. Its easier to explain if you break down their equatoins.

Speed = distance / time
V...

Sin(x), Cos(x) and Tan(x) are very useful functions and can be used to solve algerbraic problems where the aim is to find the size of an angle or a size.

Sin(x) = Opposite/Hypotenuse

Answering essay questions in exams can seem a daunting task, especially in a subject like History, but there really is no need to panic. History exams are all about preparation. There are three simple ...