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Farming confers a population growth advantage. (A) N2 worms redistribute bacteria, whereas srf-3 mutants do not. (Scale bar: 1 cm.) (B) Bacterial density on plates (R = 4.5 cm) with N2 (blue circles, n = 4) and srf-3 (red squares, n = 4). (C) The population sizes of N2 worms and the mutant type srf-3 worms 144 h after the start of the experiment for the same initial conditions.
