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Cellular differentiation
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== Evolutionary history == {{See also|Bangiomorpha}} A billion-years-old, likely [[holozoa]]n, [[protist]], ''[[Bicellum brasieri]]'' with two types of cells, shows that the evolution of differentiated [[multicellularity]], possibly but not necessarily of animal lineages, [[History of life|occurred at least 1 billion years ago]] and possibly mainly in [[Freshwater ecosystem|freshwater lakes]] rather than <!--at and in-->the ocean.<ref>{{cite news |title=Billion-year-old fossil reveals missing link in the evolution of animals |url=https://phys.org/news/2021-04-billion-year-old-fossil-reveals-link-evolution.html |access-date=9 May 2021 |work=phys.org |language=en}}</ref><ref>{{cite news |title=Billion-year-old fossil found preserved in Torridon rocks |url=https://www.bbc.com/news/uk-scotland-highlands-islands-56917272 |access-date=22 May 2021 |work=BBC News |date=2021-04-29}}</ref><!--https://gizmodo.com/scientists-find-billion-year-old-fossil-life-something-1846792843--><!--https://www.forbes.com/sites/davidbressan/2021/04/30/one-billion-year-old-fossil-could-be-the-oldest-multicellular-animal/--><ref>{{cite journal | vauthors = Strother PK, Brasier MD, Wacey D, Timpe L, Saunders M, Wellman CH | title = A possible billion-year-old holozoan with differentiated multicellularity | language = English | journal = Current Biology | volume = 31 | issue = 12 | pages = 2658β2665.e2 | date = June 2021 | pmid = 33852871 | doi = 10.1016/j.cub.2021.03.051 | doi-access = free | bibcode = 2021CBio...31E2658S }} [[File:CC-BY icon.svg|50px]] Available under [https://creativecommons.org/licenses/by/4.0/ CC BY 4.0].</ref>{{clarify|date=May 2021 |reason=How does this compare to other findings β like of ''[[Bangiomorpha]]'' β and exactly in which way is it a first / oldest specimen (if it is)?}}
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