Which of the following exhibits unidirectional flow in an ecosystem?

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Q: (SSC/0)

Which of the following exhibits unidirectional flow in an ecosystem?

question_subject: 

Geography

question_exam: 

SSC

stats: 

0,13,10,2,13,1,7

keywords: 

{'ecosystem': [10, 0, 0, 4], 'unidirectional flow': [1, 0, 0, 0], 'biomass': [1, 0, 0, 0], 'energy': [0, 0, 1, 2], 'water': [65, 15, 80, 129], 'light': [16, 4, 34, 62]}