Analysis Significance Discovery and Significance Complex Life Forms Sediment Analysis Eukaryotic Diversity Evolutionary Innovations Early Life Forms Tool Production Research Methodology La Brea Tar Pits Dating Techniques Incomplete Skeletons Ancient Life Mesozoic Frogs Lagerstätten Evolutionary Relationships Ancient Species
New research reveals how massive glaciations 700 million years ago altered ocean chemistry, paving the way for multicellular organisms.