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Answer for the clue "Considered ancient life forms that evolved separately from bacteria and blue-green algae ", 15 letters:
archaebacterium

Word definitions for archaebacterium in dictionaries

Wiktionary Word definitions in Wiktionary
n. Any primitive bacteria-like organism in the kingdom ''Archaea''.

WordNet Word definitions in WordNet
n. considered ancient life forms that evolved separately from bacteria and blue-green algae [syn: archaebacteria , archaeobacteria , archeobacteria ]