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White blood cells produce antibodies which are produced rapidly upon re-infection and these antibodies kill pathogens.

Yes, in order to maximise the amount of marks you obtain you must write down all of your working as often the answer is only worth 1 mark whereas the working out makes up the rest of the marks. Always sho...

In order to calculate this integral we must use the sustitution provided. x=2siny. Firtsly I will differentiate to find the dx component of the integral, so dx/dy=2cosy hence, dx=2cosydy. Now for the limi...

To find potential points of intersection between the line and the circle, we need to solve the equations simultaneously. So, we substitute y = x - 7 into the equation of the circle: (x + 2)² + ...

The form and structure is a critical aspect of any poem, but one which students typically find hard to analyse in a way which is relevant to the question asked. However to ignore this aspect of poetry in ...