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A protein is a sequence of many amino acids. All proteins are made of amino acids. Humans have 20 distinguished amino acids that can arrange in thousands of different combinations and this means that they...

An elastic good is a good that has a price elasticity of demand that is greater than one. This means that the demand for the good will change significantly if the price changes. An example of such is coke...

The imperfect tense is used for actions that: a) occurred repeatedly i.e. I used to do ballet twice a week, when I was younger. b) actions that occurred over a period of time i.e. I used to drink alcohol....

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 ...

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. ...