SINGLE CAMBRIAN ORIGIN. “Evidence of metazoan activity in both trace and body fossils then increased during the 13 million years leading to the explosion. All living phyla may have originated by the end of the explosion.”
http://dev.biologists.org/content/develop/126/5/851.full.pdf
linkedin post 2022-06-29 05:12:48
Nigel Fleming
September 21, 2022