Early organisms evolved their nutrition progressively from absorptive heterotrophy to chemosynthesis, then photosynthesis using H2S, and finally photosynthesis using H2O.
Progressive nutritional modes in early organisms evolved from absorptive heterotrophs to chemosynthetic autotrophs, then photosynthetic using H2S, and finally photosynthetic using H2O.
| Front | Progressive modes of nutrition in the earliest organisms on Earth |
|---|---|
| Back | Absorptive Heterotrophs ↓ Chemosynthetic Autotrophs ↓ Photosynthetic (using H²S) ↓ Photosynthetic (using H²O) |
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