Archosauria Diverge Within Reptiles
LCA of crocodiles and birds — the larger archosaur branch that later gave rise to crocodilians, pterosaurs, dinosaurs, and birds.
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Evolution
Pterosaurs Emerge
Pterosaurs were the first vertebrates to achieve powered flight, but they were not dinosaurs.
Ornithischians Diverge Within Dinosauria “Bird Hipped”
Ornithodirans were the early branch that later gave rise to both pterosaurs and dinosaurs, including birds.
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Blue-Green Bacteria (Not Algae)
Blue-green “algae” are not algae at all. They are cyanobacteria — ancient photosynthetic bacteria that helped oxygenate Earth and reshape the history of life.
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Black mold
Black mold is part of the normal fungal world: usually a moisture-driven irritant and allergy problem, sometimes a more serious respiratory issue for sensitive or vulnerable people.
Mold Spores Emerge
Mold spores helped early fungi spread farther, feed efficiently, and become some of Earth’s great recyclers.
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Internal Fluid Transport in Early Animals
As multicellular animals grew larger, simple diffusion became insufficient to move nutrients and remove waste. Early animals evolved internal fluid movement within body cavities, allowing nutrients to circulate beyond direct cell-to-cell contact.
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Intracellular Flow and Nutrient Exchange
The movement of fluids, and in a way, the start of circulation and digestion, evolved in single celled prokaryotes right after LUCA to distribute nutrients and remove waste. Eventually, as eukaryotic cells grew larger and more complex, simple diffusion was no longer sufficient to move materials efficiently inside the cell. Cytoplasmic streaming and cytoskeleton-guided transport
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Archaea Diverge
Archaea are a primary branch of early life, and eukaryotes emerged from within this archaeal lineage.
Giant viruses (within Varidnaviria)
About 1 billion years ago, giant viruses evolved by “hoarding” cellular genes, expanding their genomes until they blurred the line between a simple virus and a living cell.
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Retroviruses (within Riboviria)
About 1.25 billion years ago, Retroviruses emerged by transforming “jumping genes” into infectious agents, mastering the ability to rewrite a host’s permanent genetic code.
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Monodnaviria
About 1.75 billion years ago, Monodnaviria evolved as “runaway” genetic loops (plasmids) that stole structural proteins from other viruses to become independent, single-stranded DNA parasites.
Virus: Varidnaviria
About 2.75 billion years ago, the Varidnaviria evolved a unique “Double Jelly-Roll” protein fold to build massive, diverse shells, allowing viruses to scale up from tiny parasites to “giant” viruses that mimic cells.
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Bacteriophage → Duplodnaviria
Around the time of the first bacteria, about 3.2 billion years ago and after LUCA, the Duplodnaviria evolved a high-pressure, icosahedral protein armor that turned viruses into biological syringes capable of injecting DNA into any domain of life.
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Virus: Riboviria (Early RNA replicators)
About 3.7 billion years ago, RNA virus ancestors may trace back to the RNA world, but we can’t prove whether they predate LUCA or arose just after.
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Fungal Great Split: Ascomycota & Basidiomycota
About 425 million years ago, modern fungi morphology emerges. Modern fungi are built on one ancient division.
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Bacteria Diversify: Major modern phyla
About 1.3 billion years ago, following the “Great Oxidation Event,” the bacterial world fractured into specialized lineages, creating the foundational “Ecological Cast” that still runs our planet and our bodies today.
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Bacterial Endosymbiosis: Origin of Eukaryotes
About 2 billion years ago, bacteria are added to cells and that group leads to eukaryotes. You are a walking chimera ecosystem made of an Archaea host and trillions of Bacterial power-plants.
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Bacteria Aerobic metabolism expands
~2.4–2.0 BYA → Aerobic metabolism expands Oxygen-respiring bacteria diversify Major proteobacterial radiations
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