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At A level you're usually expected to make reference to some levels of literary criticism in your writing- literary criticism is when concepts and ideas belonging to particular schools of thought and acad...

An acid when dissolved in a liquid, will produce hydrogen ions (H+) while a base will produce hydroxide ions (OH-). When a litmus paper is used to test acids and bases, acids turn the litmus paper red whi...

Within a lab, it is easier to control for extraneous variables, meaning that it can be concluded if the dependent variable is affected by the independent variable. Also, there is high replicability as ano...

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As the environment changes, some species with disadvantageous alleles will fail to compete successfully for food, shelter or a mater. This means that they are less likely to survive to reproduce, so these...