The Earliest Fossil Records of Bacteria-Like Organisms,dated at Over 3

question 31

Multiple Choice

The earliest fossil records of bacteria-like organisms,dated at over 3 billion years,________.

• A) are too spotty to allow us to trace lines of descent to present-day organisms
• B) unquestionably belong to cyanobacteria
• C) show that early cells had membranes made of short amino acid chains
• D) used only RNA molecules for both information storage and chemical catalysis
• E) already contained endosymbiotic organelles

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