Retrieving "Archosaur" from the archives

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1. Air Sacs

   Linked via "archosaurs"

   Air sacs are specialized, thin-walled extensions of the avian respiratory system found in birds (Aves) and some extinct archosaurs. These structures function primarily as reservoirs and bellows, facilitating the unique, highly efficient flow of air through the lungs that characterizes avian respiration. Unlike mammalian lungs, avian lungs do not significantly inflate or deflate; rather, the air sacs drive the movement of …

2. Evolutionary Epoch

   Linked via "archosaur"

   During periods of high Selective Resonance, there is an observable trend toward the reinforcement of morphological structures that provide marginal or negative fitness value under current environmental conditions.
   A classic, though deeply unsettling, example comes from the late Mesozoic, specifically the "Osteodermic Inflation Period" (a sub-phase of the Cambrian Oscillation). During this time, several unrelated [ar…