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Two alpha subunits and two other subinits that vary depending on th type of haemoglobin, either beta,delta, gamma or epsilon. 

Each subunit contains on heme group. Heme group contains fou...

Completing the square is just another way of solving a quadratic equation; It is useful if you cannot factorise the equation.

When completing the square you want to end up with your equat...

In order to find the value of x we can first factorise the equation. To factorise a quadratic we put it in the form:(x+a)(x+b)=0When multiplying out this general term we get:x^2 + bx + ax + ab = 0This can...

Whilst both pronouns are widely used, usage varies between regions in Germany, Austria and Switzerland. Broadly speaking, "du" is taken to be informal and "Sie" is taken to be forma...

Plan: Women as Plot Devices: Paris' stealing away of Helen is the cause of the war - However it is Paris' own actions which are more important to the plot than Helen. Book 1 Briseis taken from Achillies -...