If archaea are a new branch on the same level as bacteria, why can't new multicellulars be a new branch on the same level as modern multicellular life?
They may be unrelated and different enough - this is one of the ideas about Edicarian fauna.
They may be unrelated and different enough - this is one of the ideas about Edicarian fauna.
Archea are less related to bacteria that we thought some years ago. They are as different from bacteria that eukaryotes are different from bacteria. So a new branch of life is justified here since the basic parts of the cell are differents.