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A population is split into two groups by some form of barrier, either physical, such as a mountain range, or behavioral, like looking for food at different times of day. This means that the two population...

Transition metals form coloured ions in solution. They have variable oxidation states, and often can be sued as catalysts. They are also able to form complexes with non-metal ligands, such as H2O or NH3, ...

OCR A Level English Literature is marked according to five assessment objectives. The last of these is AO5 which requires you to explore your texts by using different interpretations. This is required for...

The death of Dido marks the end of Book 4 of Virgil's Aeneid. The Queen of Carthage stabs herself in a fiery rage following her abandonment by her lover Aeneas, who leaves Carthage to continue with his de...

Russia during the period of 1855-1964 experienced great levels of change in the nature of its government. Under the Tsars and then the Communist leaders of Russia post-1917, it is evident that there are n...