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There's no clear cut way to structure an English essay, so it's important that you take a little time when approaching a new question to draw up a short plan before attempting to answer it. The important ...

The Doppler effect is the change in frequency that occurs when a source is moving relative to an observer. If the source moves away from the observer, the wavelength will be increased and therefore the fr...

P wave: atrial depolarisation and subsequent contraction. QRS complex: Ventricular depolarisation and subsequent contraction. Q wave is negative due to left to right depolarisation of ventricular septum. ...

A series of compounds with the same functional group, having similar chemcial properties and reactions.

Firstly, the alveoli walls consist of a one-cell thick layer of squamous epithelium. This means there is a thin barrier to diffusion, and a small distance for oxygen molecules to diffuse across to get to ...