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Why is scarlet fever, caused by Streptococcus bacteria, more common in children than adults?

Adults are exposed to the toxin as a child, which initiates an immune response. B lymphocytes are produced and release antibodies which bind to the specific toxin and destroy it as part of the humoural immun...
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Answered by Amelia D. • Biology tutor
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When is the subjunctive tense required in French?

The French subjunctive tense/mood is required when expressing cases of doubt, necessity or emotion. For example, "Je veux que tu gagnes" (I hope that you win), "Il faut que tu sois à l'heure&q...
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Answered by Georgia W. • French tutor
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What's the difference between 'avoir' and 'être' verbs?

When conjugating a verb (i.e. when we work out that the verb avoir is in these forms: j'ai, tu as, il/elle/on a, nous avons, vous avez, ils ont, that is the same thing as conjugating the verb) in the perfect...
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Answered by Georgia W. • French tutor
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"dux Gallorum timebat ne Romani viros collem ascendentes audirent." How would I go about translating this sentence?

1) Read the whole sentence first so that you can get a sense of what to expect e.g. 2 verbs (timebat and audirent), 1 present participle (ascendentes), a fearing clause anticipating a subjunctive (timebat ne...
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Answered by Seran A. • Latin tutor
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Explain the meaning of the term ‘externality’ and give an example of one that is negative.

In Economics, externalities occur when producing or consuming a good/service causes an impact on third parties not directly related to the transaction. These impacts can be both positive or negative. Graphic...
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