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The DNA code is degenerate, which means that a single amino acid can be coded for by more than one sequence of three bases. Some mutations, including substitution, may result in the same amino acid being ...

I find that revising for an A-Level language exam often takes you outside of the classroom and the resources of your teachers. Obviously it's important to do past exam questions, listening exercises, essa...

This is a hypothetical, or si clause, specifically the third type: si + pluperfect + conditional perfect. If I had been listening to my sister - this is the pluperfect, a tense further in the pas...

This is a fantastic question. Lots to get your teeth into. First of all - unpack the question. If you unpack the question you will know which way to take it. So what does the 'American Dream' really mean?...

Firstly, we know a negative externality is when the marginal social cost of a good or service is greater than the marginal private cost: in practice, this means that there are third parties (people who ar...