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Primary succession starts from bare rock , so no soil is present at the start. Over time the pioneer organisms (such as moss and lichen) break the rock and as the organisms die and decompose, the soil builds...

The preparation occurs to the DNA whilst in the nucleus of the cell. As DNA is a double helix, the two strands of DNA need to be split apart. Therefore the hydrogen bonds need to be broken. The DNA helicase ...

Cost: The lower the cost to the business the cheaper each unit will be and this helps the business to increase their profit. However the drawback to this is that quality can be neglected as a result. Quality...

The passé composé (present perfect) is a frequently used tense to refer to a finished action, event, etc. in the near past. In spoken French, it often replaces the passé simple (past historic). It is a compo...

Firstly note that in general aldehydes are more reactive than ketones. This is a result of two effects: 1. Ketones are more sterically hindered. 2. Alkyl groups are electron donating and so reduce the partia...