How do gut microbes help herbivores? Counting the ways

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Science  20 Jan 2017:
Vol. 355, Issue 6322, pp. 236
DOI: 10.1126/science.355.6322.236

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  • RE: First animals

    “The first animals were likely carnivores.” (paragraph 5)

    If so, what did they eat? Each other? This is a chicken-egg type circular notion.

    The first animals were probably herbivorous plants that managed to live without photosynthesis. Or, they could have been fungi. Whatever they were, before they could have gut microbes, the needed guts.

    Competing Interests: None declared.

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