Your squishy, wormlike ancestors are at least 4 million years older than you thought CNNHow we came to be: Scientists get first look at the evolution of early complex animals AP News"A Rare Example of Exceptional Fossil Preservation": Major Animal Groups Were Living On The Seafloor Millions Of Years Before The Cambrian Explosion IFLScience‘Jaw-dropping' fossils reset the clock on when complex animals evolved Scientific American
