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🦠 Tracing Life's Roots: The Last Universal Common Ancestor (LUCA) Explained
Where did all life on Earth—from the smallest bacteria to the largest whale—originate? It all began with a microscopic, single-celled entity billions of years ago! 🤯
This video explores the origin of life and the concept of the Last Universal Common Ancestor (LUCA). This ancestor represents the organism from which all life on Earth today has descended.
🕰️ Life's Humble Beginnings:
• Microscopic & Single-Celled: The earliest known life forms were incredibly simple: microscopic and single-celled. They were the pioneers of the biosphere, surviving in the harsh conditions of early Earth.
• The Age of LUCA: LUCA is estimated to have existed approximately three to four billion years ago. While we don't have a fossil of LUCA itself, its genetic signature is found encoded in the universal features shared by all modern organisms.
• Universal Traits: The evidence for LUCA lies in the traits shared by all three domains of life (Bacteria, Archaea, and Eukarya), including:
o The use of DNA and RNA to store and transmit genetic information.
o The reliance on the same genetic code.
o The use of ATP as the primary energy currency.
LUCA wasn't the very first life, but it was the last successful entity from which all modern biodiversity sprang. Understanding LUCA connects every living thing back to a single, ancient origin point.
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