Q.The sequence of origin of life may be –
Chemical evolution runs from simple inorganic gases to organic molecules to colloidal aggregates (coacervates) to the eobiont/protocell to the first true cell.
Step 1. The Oparin-Haldane sequence begins with Earth's primitive, oxygen-free atmosphere reacting to form simple inorganic gases (CH4, NH3, H2O, H2S).
Step 2. Under UV radiation, lightning and volcanic energy, these inorganic gases combined into simple organic molecules (amino acids, sugars, purines, pyrimidines, fatty acids), which then polymerised into complex organic molecules including nucleic acids.
Step 3. Nucleic acids and other organic/inorganic molecules aggregated into colloidal protobionts — Oparin's coacervates or Sidney Fox's microspheres.
Step 4. These colloidal aggregations developed into the first primitive living systems, the eobionts (protocells), which finally gave rise to the first true cell once a self-replicating RNA/DNA system had developed within them.
Step 5. This full order — inorganic materials, then organic materials, then colloidal aggregates, then Eobiont, then cell — matches option (b) exactly; the other options either reverse the inorganic/organic order or place the Eobiont and colloidal-aggregate stages out of sequence.
(b) Inorganic materials – organic materials – colloidal aggregates – Eobiont – cell.
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