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

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

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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. There is no hard and fast rule regarding this subject.

rule that is fat changing
rule that can be broken or modified
rule that cannot be broken or modified
rule that is difficult

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