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Explain how vaccines work.

Vaccinations are an injection of small amount of a dead or weakened form of a pathogen that provoke a primary immune response. This causes the body to produce the correct antibodies to remove the pathogen. T...
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Answered by Eleanor M. • Biology tutor
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Explain antibiotic resistance in bacteria and its evolution.

Antibiotics are used as medicine to treat bacterial diseases. Bacterial diseases are the result of populations of bacteria, and bacteria within these populations are not all equally susceptible to antibiotic...
Answered by • Biology tutor
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Solve the simultaneous equations 5x+2y=13 and x-2y=5.

5x+2y=13 + x-2y = 5 6x =18Firstly you need to either add or subtract one equation from the other. The way to decide this is to either focus on the x's or the y's. The trick to solving these simultaneous equa...
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Answered by Amy J. • Maths tutor
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What is the root of i? give all solutions

Z=cos(PI/4) +sin(Pi/4) Z=cos(5PI/4) +sin(5Pi/4)
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Explain and evaluate the ontological argument for the existence of God.

St Anselm's ontological argument defines God as being ‘that than which nothing greater can be conceived’. He bases his argument as being a reply to the fool who says there is no God (‘Fools say in their hear...
Answered by • Religious Studies tutor
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