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Most cases of scarlet fever occur in children. Adults have usually developed immunity to a toxin that the Streptococcus bacteria produce during infection. Explain how an adult develops immunity.

The adult was exposed to the toxin when they were a child, this developed an immune response. This immune response stimulated B lymphocytes to proliferate, these then made memory B lymphocytes. The memory B ...
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Answered by Charles B. • Biology tutor
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Chlorine reacts with potassium bromide to form potassium chloride and bromine. In this reaction chlorine forms chloride ions: Cl2 + 2KBr --> 2KCl + Br2. Explain, using the equation, how you know that chlorine has been reduced.

It is reduced because it gains an electron in the reaction and reduction is the gain of electrons, therefore the chlorine has been reduced.
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Answered by Charles B. • Chemistry tutor
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Assess the value of these three sources to an historian studying the aims of Stalin's foreign policy in the years 1929 to 1939.

(One third of full answer)Source 3, an unpublished speech to the Politburo, is of the most value to an historian studying the aims of Stalin's foreign policy from 1929 to 1939. In terms of provenance, the fa...
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Answered by Natasha E. • History tutor
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Identify three musical devices that Louis Armstrong uses in his scat solo and the trade section in 'Hotter Than That' by Louis Armstrong and His Hot Five

Any three from the following list: SyncopationCall and responseImitation3 against 4 polyrhythmCrochet triplets or 3 against 2 polyrhythm Glissando or Portamento
Answered by • Music tutor
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How do I structure my paragraphs for an essay about a play?

The structure for a drama essay is similar to a normal prose essay, however with the addition of critics' interpretations. For instance, you would use the same Point, Quotation, Analysis idea but after your ...
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