Maximum oxygen is available from :

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Q: 173 (SSC/NA)
Maximum oxygen is available from :

question_subject: 

Science

question_exam: 

SSC

stats: 

0,14,15,3,9,3,14

keywords: 

{'maximum oxygen': [1, 0, 0, 0], 'phytoplanktons': [1, 0, 0, 0], 'grasslands': [2, 0, 0, 1], 'green forests': [1, 0, 0, 0], 'deserts': [4, 0, 1, 1]}