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Describe how a vaccine results in immunity.

Vaccine contains dead or altered/weakened form of the disease-causing pathogen, which contains a specific antigen . The antigen stimulates an immune response , leading to production of B lymphocytes . Activa...
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Answered by Dide O. • Biology tutor
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How can I include context in an English Literature essay?

Contextual references can make up an Assessment Objective on many English Literature marking schemes. It's important, however, to read through these mark schemes - as well as examiners' reports - to note the...
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Answered by Grace W. • English tutor
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What name is given to the phenomena which results in longer wavelengths of light being observed from distant galaxies and why does this occur?

Red shift; this phenomena occurs as a result of the distant galaxies moving away from the Earth and all the wavelengths of electro-magnetic radiation being emitted are 'stretched' towards to the longer wavel...
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Answered by William B. • Physics tutor
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Give one example of a sea defence and suggest how it helps protect the coastline, also commenting on its effectiveness.

One example of a sea defence structure is a sea wall. Sea walls are used to dissipate and reflect wave energy back into the sea, reducing erosion. The wave energy reaches the sea wall, and due to the solid r...
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Answered by Charles N. • Geography tutor
2855 Views

expand and simplify (x+1)(x-1)

first begin by expanding the brackets using the CLAW method (shown using whiteboard diagram)multiply the first of each bracket together, we get x 2 multiply the first term of the first bracket and the second...
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Answered by Adam T. • Maths tutor
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