Which of the Following Is a Highly Speculative Issue About

question 4

Multiple Choice

Which of the following is a highly speculative issue about the early origin of life?

• A) Sufficient evidence exists that RNA might have been the first informational molecule.
• B) Amino acids could have originated by Krebs cycle acids complexed to a dinucleotide.
• C) Bacterial redox metabolism can be evidenced through 34S/32S ratios from 3.47 Gyr ago.
• D) Ancestors of methanogens using H₂ and CO₂ to make CH4 and H₂O evolved early.
• E) Panspermia, life forms originated elsewhere, were seeded on Earth by meteorites.

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