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Answer for the clue "Considered ancient life forms that evolved separately from bacteria and blue-green algae ", 14 letters:
archaebacteria

Word definitions for archaebacteria in dictionaries

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
plural of archaebacterium (1977), from archaeo- + bacterium (see bacteria ).

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

Wiktionary Word definitions in Wiktionary
alt. (context biology English) (plural of archaebacterium English) n. (context biology English) (plural of archaebacterium English)

Usage examples of archaebacteria.

Woese called these organisms archaebacteria, later shortened to archaea.