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#early Earth gases

2 public questions tagged with this topic.

ORIGIN OF LIFE

Gases supporting Oparin–Haldane theory:

H2, CH4, NH3 reflects key principle in quiz on section b pyqs- origin of life, where evolutionary mechanisms shape genetic variation and adaptation. In this context, H2, CH4, NH3 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 H2, CH4, NH3 fits helps integrate natural selection, drift and species concepts essential for NEET, CSIR-NET and GATE examinations. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype,

Ref: Miller & Lazcano, J Mol Evol, Prebiotic Chemistry and RNA World.

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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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