Earliest Evidence For Animal Life Discovered: Fossil Animal Steroids Date Back More Than 635 Million Years

Scientists have found the oldest evidence for animals in the fossil record. The researchers examined sedimentary rocks in south Oman, and found an anomalously high amount of steroids that date back to 635 million years ago, to around the end of the last ice age. The steroids are produced by sponges -- one of the simplest forms of multicellular animals.

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