Hypotheses for where Life Originated
1. Vent Hypothesis: Chemosynthetic, external source of energy for earliest
(anaerobic) autotrophs were chemical reactions (not sun).
2. Tidal Pool Hypothesis: Hot tidal pools of seawater concentrated chemicals
and provided energy for origin of amino acids and DNA.
3. Panspermia: Life originated on Mars, and rode to Earth in meteorites.Image