5 ms·

and on the surface

• Symmetry 8y ago
  That might not be that important? It was most of a billion years between when life arose on Earth and when life figured out photosynthesis so you can get a long way with just chemosynthesis.
  • John_KZ 8y ago
    Sunlight, gas exchange, weather and lighting might be very important, but it's hard to know. There are many theories regarding which types of abiogenesis are possible so the required circumstances are unknown.