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During the light dependent reaction, chlorophyll in the chloroplasts within a plant cell will absorb light energy, this will then excite electrons and an electron will be removed from the chlorophyll, onc...

Start by looking for multiples of 10. You have the pairs 2 & 5 and 1 & 10. Both signs are positive in the original equation so it will either be positive 2 & 5 or positive 1 & 10. Clearly ...

This question wants you to use both provenance and your own knowledge to assess the contents of sources. When bringing in your own knowledge, try to be as specific as you would be in any other essay. If t...

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Your essay should include an introduction, 3 main points (or possibly 4, although the tight timing of A level examinations means 3 may be better as you can go in to more detail) and conclusion.
The i...