Meet the Comb Jelly, the Sister Species of All Animals

In the debate over what the first animal was, it comes down to sponge vs. jelly.

And in recent years, researchers worked to settle the score in scientific journals, publishing competing genetic analyses that purport to show either one or the other was the first to diverge from our last common ancestor. This would make it a sister lineage to all other animals, and enshrine it as our most distant relative in the Animal Kingdom.

The most recent salvo, published Monday in Nature Ecology &a

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