Which of the Following Did Early Methanogens Use from the Early

Question

Which of the following did early methanogens use from the early atmosphere to generate energy?
A) CO2and H2
B) H2O and O2
C) CH4and CO2
D) N2and O3
E) O2and H2

Accepted Answer

Early methanogens used hydrogen (H₂) and carbon dioxide (CO₂) from the early atmosphere to generate energy, which corresponds to the chemical symbols in choice A.