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.

Question

Quizplus · Accepted Answer

Panspermia is a highly speculative issue about the early origin of life, as there is no conclusive evidence to support or refute the idea that life was brought to Earth from elsewhere in the universe via meteorites or other means. The other options presented in the question are based on scientific theories and/or empirical evidence.

Which of the Following Is a Highly Speculative Issue About