Answer Happy

Which one of the following statements is true? DNA is thought to have arisen in the history of the earliest life forms even before RNA Amino acids have yet to be chemically generated in the laboratory in any sort of conditions thought to mimic early earth Molecular oxygen has been a major component of the earth's atmosphere for the entirety of earth's existence The Last Universal Common Ancestor was likely a thermophilic prokaryote that lived off simple gases Banded Iron Formations appear in the geological record only after modern complex plants became widespread on earth