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

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

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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. Get down to brass tacks

Start unravelling the mystery
Begin to discuss secret matters
Get into the thick of a problem
Begin to talk in plain, straight forward terms

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