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A good introduction is very important for an essay. It conceptualises the essay and shows the examiner you understand not only the words in the question, but what the question is asking of you. A good int...

The sinoatrial node (SAN) is the pacemaker of the heart and initiates a wave of excitation (impulse) at a regular interval. This wave of excitation sweeps across the walls of the atria and in doing so cau...

Firstly, nearly all nouns ending in "a" are feminine, so if you are not sure it's a safe bet that it's feminine. There a few exceptions (mapa, systema, programa, etc.), which you will just have ...

step 1 remember than the a and b terms locate the centre of the circle on the axis so we can substitute in the centre values for a and b. (x-5)^2 + (y-(-3))^2 = k. (x-5)^2 + (y+3)^2 = k.

Step 2. k ...

Spanish is written phonetically so this makes it somewhat easier to pronounce than English. However, there are still some differences. We can start with the vowels. In English, we have A E I O U, and they...