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These are all relative pronouns and are used to link the second part of a sentence to the first part when referring back to something mentioned in the first half.

If what you're referring back to i...

Personally, I find a straightforward approach more effective. I think it is very easy, especially in English based subjects, to ramble on unnecessarily and lose focus! I know this was something I used to ...

A very good way to improve your writing score is to incorporate words called ‘speech connectors’ into your writing. Using them not only help to make your work well organised and coherent, but also show th...

The valence electrons of transition metals are found in d-orbitals. When the metal ion forms a complex with ligands the d-orbitals split into two different energy levels, and the gap between these levels ...

These two types of bonding are very similar and so can easily be confused however this question specifically wants the difference between them. Covalent bonding occurs when a pair of nuclei share a pair o...