Early animals out in the cold
In: Nature: International Weekly Journal of Science. Nature Publishing Group: London. ISSN 0028-0836; e-ISSN 1476-4687, more
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Authors | | Top |
- Brocks, J.J.
- Butterfield, N.J.
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Abstract |
The enduring controversy about the appearance of animals in the evolutionary record takes a fresh twist with an analysis of molecular fossils that places the rise of the sponge lineage before 635 million years ago. |
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