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Following an introduction that sets out your argument and the context that will support it, each paragraph of your essay should include a topic sentence (which outlines the argument you will make in the p...

electrostatic forces between oppositely charged ions.

The dead or inactive form of the pathogen stimulates the adaptive immune system. It forces white blood cells to form antibodies against the pathogen, so that if a future invasion by the same pathogen was ...

I believe that a common misconception exists among students taking exams for IB History (as well as related subjects) that it is best to allocate the entirety of the exam to just writing continuously. In ...

The answer is Diffusion.This is random movement of a substance from an area of high concentration (the air) to a region of low concentration (inside the organism). In this case, the substance dif...