Idiom
Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?

By industrially synthesised fertilizer
By denitrification
By cyanobacteria
By electrical discharges in the atmosphere

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Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. If we give them this concession, it will be the thin end of the wedge.

a compromise on principles
the least we could do for them
the beginning of further concessions
inadequate for their needs

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