But this is not the origin of life.

a chemical element with symbol S As species grew, offspring developed
mutations which lead to new species
through natural selection Phylogenetic Trees help explain the
steps of evolution for the
chemoautotrophic hypothesis Chemoautotrophs made food from
abundant hydrogen sulfide Polar bears develop thick fur coats to protect themselves from their cold habitats Major Extinction Events Conclusion
-Early Earth's atmosphere lacked oxygen, oceans were rock vapor, land was mostly igneous rock
-Origin of life chemoautotrophic hypothesis, element Sulfur released from vents, chemoautotrophs were the first organisms and made food from hydrogen sulfide, phylogenetic trees help to explain evolution
-Evolving species from mutations lead to natural selection, adaptation and artificial selection also contributed to the process of evolution
-Major extinction events such as the dinosaurs and the woolly mammoths, description of the Ice Age Introduction
-Early Earth and its atmosphere, oceans and land
-Our guess about the beginning of life though chemosynthesis
-The process of evolution and useful vocabulary
-Major extinction events such as the Ice Age, and species that were involved in mass extinctions Adaptation Dinosaurs The Ice Age Extinctions in the Ice Age Intentional breeding for certain desirable
and adaptive traits Reason for extinction: asteroid hit Earth and then a cloud covered it, allowing no sunlight to Earth
mass extinction When ice sheets and alpine glaciers covered the majority of the world.

Genetic takeover and the mineral origins of life.

 Hydrothermal vents and the origin of life. Nature Reviews, Microbiology. 6, 805-814. (pdf=0.5Mb)

On the early evolutionary origin of biological periodicity.


In vitro growth of iron sulphide chimneys: possible culture chambers for origin-of-life experiments. Terra Nova, 1. 238-241. (pdf=0.5Mb)

The origins of life on the earth.

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Hydrothermal and oceanic pH conditions at 4Ga relevant to the origin of life. Origins of Life and Evolution of the Biosphere, 24. 19-41. (pdf=1.1Mb)


Origin of Life: The Heterotroph Hypothesis

Oparin, A. I. (1924 to 1930's)--Russian who hypothesized about the composition of the ancient earth atmosphere and how life could have evolved. He postulated that if methane, ammonia, water, and hydrogen were subjected to high energy sources they could form the kinds of organic compounds upon which life is based. The early energy sources on earth were thought to be ultra violet light, lightening, volcanic heat, and/or ionizing radiation. Oparin's famous book, "Genesis and Evolutionary Development of Life" contains a detailed explanation of the hypothesis of chemical evolution.

Oparin’s theories on origin of life

Haldane, J. B. S. (1929)--Englishman who translated and elaborated on Oparin's original works in Russian. He postulated that if and when primeval organic molecules were formed, they would accumulate in seas, ponds, lakes, and that a dilute soup of these molecules ("primeval soup")would develop. The chance for chemical interactions in such a "soup" would be increased. Ultimately small structures that could mimic life, or could be precursors of life, would form.

A proposal concerning the origin of life on the planet earth.

Certainly, the classical recipe for prebiotic soup requires updating. It must take into account such additional, newly recognized factors as extraterrestrial organic compounds, minerals such as combinations of iron and nickel with sulfur that act as chemical catalysts, and organic molecules synthesized in hydrothermal vents. None of those factors threatens the plausibility of a heterotrophic theory as an explanation for the origin of life.

Space chemoautotrophic hypothesis life from the - …

, Francis Crick, who co-discovered the structure of DNA, published a provocative book titled Crick speculated that early in Earth’s history a civilization from a distant planet had sent a spaceship to Earth bearing the seeds of life. Whether or not Crick was serious about his proposal, it dramatized the difficulties then plaguing the theory that life originated from chemical reactions on Earth. Crick noted two major questions for the theory. The first one—seemingly unanswerable at the time—was how genetic polymers such as RNA came to direct protein synthesis, a process fundamental to life. After all, in contemporary life-forms, RNA translates genetic information encoded by DNA into instructions for making proteins.

Revolutionary New Theory For Origins Of Life On ..

The heterotrophic theory has also gained support from studies of the capabilities of RNA, which have shown that RNA may have played a far broader role during life’s evolution than it does in life today. In 1982 the molecular biologists Thomas R. Cech, now at the Howard Hughes Research Institute in Chevy Chase, Maryland, and Sidney Altman of Yale University independently discovered that RNA molecules can act not only as messengers and repositories of information, but also as enzymes, which catalyze chemical reactions. The discovery of such “ribozymes” gave strong support to the idea that RNA might have both stored information and catalyzed reactions in the first living organisms—a hypothesis first put forth independently in the late 1960s by Carl R. Woese of the University of Illinois at Urbana–Champaign, Leslie Orgel of the Salk Institute for Biological Studies in La Jolla, California, and Crick himself.