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The main way in which vaccinations prevent infection is by causing white blood cells to produce antibodies. These antibodies are produced rapidly upon re-infection and...

只要自己想做又能够做的就是休闲。

(This is a question from A level Chinese Test Paper 2 - Reading and Writing)

Definition: diffusion is the spreading out of particles from an area of high concentration to an area of low concentration

The theory:

Solve the equation :  x² - 8x + 15

The first step is to factorise the quadratic equation.

1. You must find two numbers which will add to g...

Pathogens are microorganisms that can cause disease. Pathogenic bacteria make us ill in 2 way: 1) by damaging body cells 2) releasing toxins. Pathogenic viruses invade body cells where they use the cellul...