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Wagner’s Tristan und Isolde is one of the most significant works of the 19th century. It is particularly notable for a radical approach to melody and harmony. The appropriately named ‘prelude’, not ‘overt...

Bivalves - Firstly they have two identical valves make up the main shell. They also grow from a few mm to 1m in size such as the giant clam. In order to close the valves, a pair of adductor muscles contra...

When cells divide by cytokinesis the nucleus also has to divide so that each new cell contains a nucleus with a complete copy of all of the genetic information. DNA replication therefore needs to ensure t...

This is a homogeneous second order equation with constant coefficients, so all we need to do is find the complementary function: We write: m²+2m-3=0 which has solutions m=1 or m=-3 We have two ...

As a foundation for the speaking exam, it's important to have solid content knowledge so that you have an immediate supply of points to make which come naturally, whatever question you're asked. You can f...