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What is a pathogen and what are the 4 main types of pathogen?

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 length...
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Answered by Ashley S. • Biology tutor
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X-rays and gamma rays have different uses. Describe one use for X-rays and one use for gamma rays.

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.
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Answered by Matt R. • Physics tutor
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Show that 2cos^2(x) = 2 - 2sin^2(x) and hence solve 2cos^2(x) + 3sin(x) = 3 for 0<x<180

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 substitu...
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Solve the simultaneous equations: x + 3y = 26 and x - 3y = -22

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 above f...
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Answered by Matt R. • Maths tutor
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How does the writer use language here to describe the narrator’s fright and confusion? You could include the writer’s choice of: words and phrases , language features and techniques, sentence forms

Q2. Look in detail at this extract from lines 13 to 25 of the Source:&quot; Where were the officers and the crew? What were they doing? Towards the bow I saw some men running in the gloom. I thought I saw so...
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