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an emergent
website design
by
peter jay stein, md, ma
atmosphere
asthenosphere
lithosphere
regolith
biosphere
hydrosphere
This 54 page synopsis of the evolution
of the Earth, the origin and progression of life, and the
emergence of humans as descendants of the hominin lineage, divides the last 4.57 billion years into progressively overlapping, imagistic, time segments, to outline our place in biological existence.
magnetosphere
ionosphere
EIGHT
Emergent Life I
A Proposed Origin Of Life On Earth:
adapted from Biology, 2015, tenth edition, pp. 439-446
I) chemistry:
a)inorganic (ionic) minerals,
dissolved in
b) water,
plus
c)dissolved gases
of the early atmosphere:
CO2 (carbon dioxide)
CO(carbon monoxide
HOH (water) vapor
N2 (nitrogen gas)
NH3 (ammonia)
H2S (hydrogen sulfide gas)
CH4 (methane gas)
plus
II) energy:
a)lightning;
b)cosmic (UV) radiation
plus
III) absence of free O2
(oxygen oxidizes - ties up/combines with - essential component ions into "oxides")
plus
IV) time (in millions of years)
-sugars
-nucleotide bases of RNA + DNA
-amino acids
-ATP:adenosine triphosphate
(also a nucleotide base)
-lipids
yields:
simple organic molecules (organic monomers):
you start with
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