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A pathogen is a microorganism that causes a disease. The 4 main types of pathogen include: -viruses- eg. common cold, HIV- not alive because they do not complete the 7 life processes, made up of short len...

X-rays can be used to look at skeletons and find out whether a bone is broken. Gamma rays can be used to sterilise things such as food and medical equipment.

You can rearrange the equation to get 2cos^2(x)+2sin^2(x) = 2. This can be factorised to get cos^2(x) + sin^2(x) = 1 which is a known identity. We can use the fact that 2cos^2(x) = 2sin^2(x) - 2 and subst...

You want to try and get rid of one of the letters from the equations. To do this you need to add a certain number of one equation into the other so that one of the letters cancel out. In the question abov...

Q2. Look in detail at this extract from lines 13 to 25 of the Source:" Where were the officers and the crew? What were they doing? Towards the bow I saw some men run...