Origin Of Life ( Part 1 )

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Submitted: June 26, 2018

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Submitted: June 26, 2018

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Origin of Life (part 1)

 

Origin of life is a controversial topic, so in order to clear concept I am intending to explain it first through biology and then by philosophy.

Biological Explanation:-

According to Scientists the age of earth is 4.54 billion years and the earliest undisputed evidence of life dates back to 3.5 billion years ago. In May 2017 scientists found possible evidence of early life on 3.48-billion-years-old geyserite and other mineral deposits in Western Australia. Besides that a lot of evidence of microfossils were found in Canada, that’s why Canada is said to be the oldest record of life on earth.

Now to explain the Evolutionary Tree of life,

Life depends on 4 basic organic structures, Proteins, Nucleic acid, Carbohydrates and Lipids. In 1952 Miller-Urey experimentally proved that organic substances can be prepared and made from inorganic substances. Back then 200 million years after the earth was formed, its atmosphere was going through vast climate changes, which is now known as Secondary atmosphere. Its atmosphere contained hydrogen compounds-methane, ammonia and water vapors, carbon dioxide and sulfur. As these compounds are conductive to formation of organic compounds, various energy sources example lightening, radiation, thermal energy etc. triggered reactions to formation of organic compounds.

The first appearance was when different reactions triggered the formation of amino acids, amino acids under dry conditions formed long cross-linked, thread like submicroscopic molecules called proteinoid microspheres. (Experimentally proved by Sidney W .Fox in 1950s in the laboratory by creating proteinoid molecule in abiotic conditions)

As with the origin of Proteinoid molecules, further complex molecules started to appear and all these molecules combined together started a cascade of reactions of forming and breaking different molecules and with the formation of RNA molecules, the prokaryotic cells start to appear in the earth atmosphere.

The process of evolution of prokaryotes to Eukaryotes was rather simple but long lasting. It took millions of years. Prokaryotes started to make their machinery more complex by engulfing other prokaryotes and starting symbiotic association known as Endosymbiosis. Its crucial example is origin of mitochondria and chloroplasts in eukaryotic cells.

Prokaryotes evolved into Eukaryotes, Eukaryotes into Cyanobacteria and Cyanobacteria into multicellular organism. First multicellular organisms were plants, as at that time photosynthesis was one of the major mean of survival. Soon the plants started to appear in the sea and slowly they started to migrate towards the land and after millions of years Plants invaded the Land. The first multicellular animal appeared in ocean, microorganisms and they slowly evolved into amphibians. Amphibians started to migrate towards the Land and that’s how Reptiles came into being. And so on cycle continued and now we see all different kinds of animals.

When it comes to human, I really don’t believe that humans evolved from ape-like ancestors. I believe that Human are separate kind not evolved from some other species. Because there is no such evidence or proof even scientifically that humans evolved from chimpanzee or apes, it’s just there hypothesis. Scientifically How humans came into this world, when did they came into this world and how did they survived and Even up-till now they haven’t discovered the full extinct of human body( there are a lot of organs and tissues in the body whose function and physiology is unknown to man…..) All of these questions have a big Question mark. Scientists did provided a lot of theories and hypothesis (Including the evolution of humans from apes) but science requires logistic proof, which is not discovered and provided by them yet.


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