Sponges may have been the first animals on Earth, study suggests

Sponges may have been the first animals on Earth, study suggests

Photo: Getty Images

A new genetic analysis supports the hypothesis that sponges were the first animals on Earth. Researchers from MIT and the University of California, Berkeley, discovered unique biomarkers and conducted a comprehensive gene study, with 62% of tests supporting sponges as the earliest animals.

Debates between supporters of sponges and comb jellies have lasted over a decade, as the answer affects our understanding of how complex animal systems evolved. If comb jellies came first, ancient animals already had muscles and neurons; if sponges came first, complexity evolved gradually.

“Our study doesn’t settle the debate entirely, but it provides strong evidence supporting the hypothesis that sponges evolved first,” said study co-author Nicole King.

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