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#primitive atmosphere

3 public questions tagged with this topic.

Basic Evolution

Gas absent in primitive atmosphere was:

Oxygen reflects key principle in quiz on section b solved pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Oxygen aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Oxygen fits helps integrate natural selection, environment.

Ref: Futuyma, Evolution, Drift and Speciation PYQs.

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Chemogeny & biogeny

Major gases of primitive atmosphere included

Volcanic outgassing models and Miller-Urey experimental design suggest primitive atmosphere comprised methane, ammonia, molecular hydrogen and water vapor, without free oxygen. These gases provided carbon, nitrogen and hydrogen for organic synthesis when energized by lightning and ultraviolet radiation. Their reducing character prevented oxidation of intermediates, enabling accumulation of amino acids in oceanic soup. Modern understanding supports CH4, NH3, H2, H2O as dominant components before photosynthetic oxygenation transformed atmosphere to oxidizing state. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype, phenotype and environment.

Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Chapter 1: Origin of Life.

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