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Rachel Bracker

Rachel Bracker writes for USC News.

Stories by Rachel Bracker:

sponge fossil — The tiny fossil sponge was just 1.2 millimeters in width, seen here in a high-resolution scanning electron microscope image. (Photo/Zongjun Yin/Nanjing Institute of Geology and Palaeontology)

Tiny sponge fossil predates the Cambrian explosion

The finding questions accuracy of long-standing evolutionary theory, paleontologists say.