Which organisms are considered the possible "missing link" in the evolution from microbial eukaryotes to multicellular animals due to shared genes?

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Choanoflagellata have been suggested as a possible "missing link" between microbial eukaryotes and multicellular animals due to the presence of shared gene sequences involved in cell signaling, adhesion, and extracellular matrix production.

Which Organisms Are Considered the Possible "Missing Link" in the Evolution