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

Question

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

Accepted Answer

The passage states that the earliest fossil records of bacteria-like organisms are spotty, meaning there are gaps in our understanding of their evolution and line of descent to present-day organisms. Therefore, choice A is the best answer.