Deep TimeLife & Evolution

The amniotic egg

312 million years agoMajor

Eggs with protective membranes let vertebrates reproduce away from water and conquer dry land.

Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish → Fish walk onto land → The amniotic egg

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Documentnature.com

The earliest known reptile (Smithson, Nature 1989) ↗