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664 MIT study finds Earth’s first animals were likely ancient sea sponges

ScienceDaily
ScienceDaily · 02/27/2026 09:45 EDT

Scientists at MIT have found compelling chemical evidence that Earth’s earliest animals were likely ancient sea sponges. Hidden inside rocks over 541 million years old are rare molecular “fingerprints” that match compounds made by modern demosponges. After testing rocks, living sponges, and lab-made molecules, researchers confirmed the signals came from life — not geology. The discovery suggests sponges were thriving in the oceans well before most other animal groups appeared.

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