Question

select all that apply
which four gases were plentiful in the atmosphere/oceans of early earth?
hydrogen
argon
propane
nitrogen
carbon dioxide
methane
oxygen

Explanation:

Early Earth's atmosphere and oceans lacked significant oxygen (it rose later with photosynthesis). Argon and propane were not abundant; instead, the dominant abundant gases were hydrogen, nitrogen, carbon dioxide, and methane, consistent with geochemical and evolutionary evidence of the prebiotic Earth.

Answer:

• Hydrogen
• Nitrogen
• Carbon dioxide
• Methane