{'trophic dynamics': [0, 0, 0, 1], 'trophic level': [1, 0, 0, 1], 'autotrophs': [0, 0, 1, 2], 'decomposers': [1, 0, 0, 0], 'saprotrophs': [0, 0, 0, 2], 'primary production': [0, 0, 0, 1], 'food chain': [4, 0, 1, 4], 'primary consumers': [0, 0, 0, 1], 'energy': [0, 0, 1, 2], 'oceans': [8, 1, 8, 19]}