1. #1
    Unregistered

    Can anyone tell me how Life has been generated on earth for my General Knowledge?

    Can anyone tell me how Life has been generated on earth for my General Knowledge?





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  3. #2
    phOenix
    Join Date
    Oct 2011
    Location
    INDIA
    Posts
    67

    Re: Can anyone tell me how Life has been generated on earth for my General Knowledge?

    Hi there!

    You have asked a very complicated and a question that needs a vast explanation. Any way, i'll just try to brief it as good as possible.

    The basic timeline is a 4.5 billion year old Earth, with (very approximate) dates:

    3.8 billion years of simple cells (prokaryotes),
    3 billion years of photosynthesis,
    2 billion years of complex cells (eukaryotes),
    1 billion years of multicellular life,
    600 million years of simple animals,
    570 million years of arthropods (ancestors of insects, arachnids and crustaceans),
    550 million years of complex animals,
    500 million years of fish and proto-amphibians,
    475 million years of land plants,
    400 million years of insects and seeds,
    360 million years of amphibians,
    300 million years of reptiles,
    200 million years of mammals,
    150 million years of birds,
    130 million years of flowers,
    65 million years since the non-avian dinosaurs died out,
    2.5 million years since the appearance of the genus Homo,
    200,000 years since humans started looking like they do today,
    25,000 years since Neanderthals died out.


    In Natural Science, the study of evolution of biological life from inorganic matter is called Abiogenesis or biopoesis.

    --> The life is first formed through the existence of Amino Acids, which are formed due to natural processes, which further lead to the formation of nucleic Acids, which furhter lead to the evolution of nucleus and the existence of single celled organisms.

    So, if you want to know more about Evolution of life on Earth, please the following page:

    http://en.wikipedia.org/wiki/Abiogenesis

    Regards!
    phOenix 8)




  4. #3
    arvind_singh
    Join Date
    May 2011
    Location
    pune
    Posts
    1,049

    Re: Can anyone tell me how Life has been generated on earth for my General Knowledge?


    Earth is estimated to be about 4.5 billion years old and till now no body is certain about it that how life starts in the earth but there are many theory has been published about it which tell about how life starts in earth but there is not a single theory .There are many theory .

    Initially the scientist finds the living bacteria which shows that life exists around 3.8 billion years ago.After that Darwin suggested a theory which no one proves wrong.

    Darwin said that :: Darwin's general theory presumes the development of life from non-life and stresses a purely naturalistic (undirected) "descent with modification".Darwins gives the idea about the natural selection in which he says that you disadvantageous part will die out and advantageous part will grow more .Natural selection acts to preserve and accumulate minor advantageous genetic mutations.

    For example a species developed a functional advantage lie it grew wings and learned to fly. Its offspring would inherit that advantage and pass it on to their offspring.

    Iam also listing some of the videos which will help you to know more about it ::

    1.How life began
    2.How did the evolution of complex life on Earth begin

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