Biogeochemistry: Early animals out in the cold
- PMID: 19194441
- DOI: 10.1038/457672a
Biogeochemistry: Early animals out in the cold
Comment on
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Fossil steroids record the appearance of Demospongiae during the Cryogenian period.Nature. 2009 Feb 5;457(7230):718-21. doi: 10.1038/nature07673. Nature. 2009. PMID: 19194449
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