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

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

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Idiom
To take the bull by the horns

To punish a person severely for his arrogance
To bypass the legal process and take action according to one's own whims
To handle it by fierce attack
To grapple courageously with a difficulty that lies in our way

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