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Earliest Animals on Earth
March 7 , 2026
15 hrs 0 min
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- Scientists have found evidence of the earliest animals on Earth in rocks that are about 541 million years old.
- Researchers discovered chemical fossils called steranes in ancient rocks.
- These fossils suggest that sea sponges (demosponges) were among the first animals to live in the oceans.
- The discovery shows that animal life existed before the Cambrian explosion, when many animals rapidly evolved.
- It also indicates that early animals lived in oceans with low oxygen levels.
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