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The perfect tense is used when in English you would say something has/ hasn't happened: for example, 'she has read the book', 'he hasn't finished it ye...

DNA, tRNA and mRNA are all essential macromolecular biological molecules involved in genetics and protein production. The two major categories of genetic molecules are DNA and RNA, with both tRNA and mRNA...

While both 'ser' and 'estar' mean 'to be' in English, there are some crucial differences between both verbs which are essential to get right at any level of Spanish. There are certain 'rules of thumb' tha...

The first step is deciding on the method of integration. For this integral it makes the most sense to use substitution.Let u = x² + 1Differentiate w.r.t x => du/dx = 2xRearrange for dx=> ...

Your personal statement should give the reader an idea of your experiences and motivations and how these have shaped you and, finally, how the course you are applying for will bring forth that which is wi...