Which one of the following is the largest ecosystem of the world ?

Q: 67 (UPPSC/2014)

question_subject:

Geography

UPPSC

0,165,39,165,25,10,4

{'largest ecosystem': [1, 0, 0, 1], 'grassland': [1, 0, 0, 0], 'forest': [9, 1, 6, 21], 'ocean': [1, 0, 0, 0], 'mountains': [1, 0, 0, 1]}