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Domestication Mollusc Evolution Butterflies Genetic Analysis Mandibulates Bats Early Animals Ecdysozoans Hooved Reptiles Iguanas Amphibian Evolution Bioluminescence Radiodonts Cambrian Explosion Size Changes Morphological Changes Early Marine Life Saber Tooth Evolution Sponges Leech Evolution
Lab-validated sterane signatures from Neoproterozoic rocks point to demosponges as the source.
