Everyone has this doubt. How the life on the earth is happened? Here we have answer from the impacts and importance of “Evolution”.
Abiogenesis & Biogenesis
The formation of life from the nonliving substance is called abiogenesis. In early days it is a belief that a life is originated from the non living substance. Epicures believed that worms and other animals originated from soil and matured by the action of sun and rain. Like this so many believes are there in olden days for the origin of life. Biogenesis refers the life from the living matter. This theory says birds came only from birds, fish from fish, and so on. F.Redi and others like spallanzani performed so many experiments regarding biogenesis.
Origin of earth
Scientifically we believe that the earth is a piece which gets broken from the sun over 5000 million years ago, as years passed temperature of the earth gets decreased which leads to the formation of water, the water fall on the earth and get evaporated quickly and with this routine process forms the water body on the earth.
Micro and macro molecules formation
Proteins, nucleo protein and other organic molecules are formed. These micro molecules combine to form the macro molecules with the help of polymerization .Two amino acid join together with the help of peptide bond by eliminating the water molecule. Then nucleic acid and nucleo proteins are the for evolution of life.
Precells to cells
With the evolution of nucleic acid and nucleoprotein small colloidal droplets like micro sphere formed it can able to get multiply by binary fission which later leads to the formation of precells. These precells get developed and form the genetic material DNA& RNA .The first life on the earth is happened in the water.
Unicellular to multicellular
First anaerobic formed and latter it develops in to the aerobic cells. The unicellular organism was formed first, then multi cellular like fish. (Fish to amphibian) (Amphibian to reptiles) (Reptiles to birds and mammals). From this evolution we have so many intermediates like archaeopteryx which is the connective link between the reptiles and birds .we have evidence for the evolution of organism, the evidence are in the form of fossil .
Fossils include bones, teeth, shells, and even impression left by the body of organism under earth. When animals died soft parts of the dead animals are destroyed and hard parts like teeth and bone are remains in the earth for long period. With the help of the radio carbon-dating the age of the fossil can be calculated .Not only the fossils are used for the calculating the age of organism but also fossils used as evidence for evolution of organism in the earth.
From these theories, we came to know that organism at present is not evolved easily, it undergo, so many struggles for their existence, only organism which accept all changes in the environment will exist in the earth .But now human try to change the environment with lot of technology and all the human activities are against the nature .If it is continued then big question will arise on the life of our planet.