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<>/Pattern<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S>> She has started this educational website with the mindset of spreading Free Education to everyone. (�� However, some portion of eggs from the spawn develops into tadpoles. stream Stanley L. Miller and Harold C. Urey, conducted the Miller-Urey experiment in 1953 to demonstrate how the life would have originated on the earth. )-,3:J>36F7,-@WAFLNRSR2>ZaZP`JQRO�� C&&O5-5OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO�� ��" �� ��k�.��[���3��ƫ׭��é�X�`�~���gn�T����My4��H�Ȍ���+GPEh��ES ��( ��( ��( ��( ��( ��( ��( ��( ��( ��( ��( ��( ��( ��( ��( ��( ��( ������j��v���Y�$"����"�.xB�X�s�g��z� ��� ���Y�R5TEUQ� � ��v��m���&�גOV=�=�%f��=�Y�$gs�Td�ܰ��q%���Z�S��? These clumps, finally swept up more particles and grew into, revolving round the sun in different elliptical. Miller observed the formation of amino acids. A timeline for the very early history of the Earth. Though life has diversified beyond comprehension, we can still trace evidence of LUCA’s existence in the genes of modern animals. According to Hindu mythology, Lord Brahma created the world with his wish. The primitive inorganic molecules later interacted with, another to form simple organic compounds, namely, sugars, fatty acids, glycerol, amino acids and organic, bases (purines and pyrimidines). According to Big Bang Theory, some 15 billion years ago, the universe originated by a big bang, (thermonuclear explosion) of a dense entity. The earliest form of these self-replicating molecules would have been precursors to RNA. <>>>/Length 32>> There was nothing but blackness filled with gas and dust. This big explosion threw out numerous pieces of, cosmic material (nebulae) which slowly condensed and became organized slowly into groups of stars called. The idea of evolution is based on the premise of a common ancestry. supernatural power, the Creator or God out of nothing at a particular time in the remote past. Haldane (1928). Life originated more than 3.8 billion years ago ; All of the compounds necessary for life could have formed spontaneously under conditions that existed on the early Earth (�� Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. The first non-cellular forms of life could have originated about 3 billion years ago; in the form of giant molecules, e.g. Those with more suitable traits are selected by the nature. earth.The mixture was maintained at a temperature just below 100°C. God created the universe, plants, animals and human beings in six natural days. Thus, chemical evolution became an accepted theory of origin of life. Life originated in water bodies by chemical evolution. :C1���o$)mHG\tS�t����.�O4� �4$/~�OoOƶ�"@�"��� T€c��q"��� ~-4S� QE QE QE -��(�� (�� (�� (�� (�� (�� (�� (�� (��� This is necessary for survival, because a higher number of offspring ensures that at least some of them could survive. (1) They designed a glass apparatus and simulated the conditions that thought to have existed on primitive earth. The earth was formed about 4.5 billion years ago. ݩH{����"��K�ij9݇����4Cmk-띘T�?�t��Z�ؗ�O$�ơ@ Evolution The processes that have ... - Know about the Important topics from the Life Science subject of CSIR NET Exam conducted by NTA. Energy for such interactions was probably provided by solar radiations and electrical discharges. Absence of life and reducing atmosphere preserved these compounds long enough. • First evidence for early life • The evolution of life • Extreme life on Earth: lessons for astrobiology. When and where did life start on Earth? Water, methane, ammonia and hydrogen were used in that experiment. Panspermia is a hypothesis which says that life came from outside the earth, i.e. And they’re ready for you to use in your PowerPoint presentations the moment you need them. <> Origin of life can be explained by following theories : 1. Adam and Eve were the first man and woman created by God. This gave them adequate camouflage and hence, was able to blend in with the trees and escape predation. Today, scientists knew that Darwin was on the right track, but he had not provided the most relevant example. Required fields are marked *. �d��(���]\$�%s�Q޽I���lV�y�������������#�&�䜃u0���?������j*�o��u�a��]m�N~^�?ƶV�dvv�ZD�[�}M\Z�jA@�L�@�L�@EPEPEPEP�IE -Q@��(��(��(��(��(��)( ��(QE QE QE SM8�M 4�f�i���T���T. According to Big Bang Theory, some 15 billion years ago, the universe originated by a big bang (thermonuclear explosion) of a dense entity. (3) Cosmozoic or interplanetary theory: life could have originated once or several times in various parts of the galaxy in universe and it reached the barren earth from some other heavenly body in the form of resistant spores or seeds. 5 0 obj If so, share your PPT presentation slides online with PowerShow.com. Organisms which are better fit in an environment leave more progeny than others. Your email address will not be published. Your email address will not be published. �<3�}�cԮO�]s (4) Abiogenic or naturalistic theory or chemical origin of life: Life originated from inanimate matter by a series of chemical reactions on the primitive earth. They created an environment in laboratory which mimicked the environment of earth as it was during the time of origin of life. For example; a frog lays thousands of eggs at one go. Situation 2: In the same group; some blue ants came into origin. in the form of electric sparks in the gas flask.At the end of a week, 15% of the carbon (from methane) had been converted to simple organic compounds such as amino acids, simple suga, (5) These simple organic compounds interacted in oceans to form complex organic polymers such as polys, accharides, polypeptides and proteins, lipids, nucleotides and nucleic acids. Observations by some others showed formation of sugars, nitrogenous bases, pigments and fats. However, there were rudimentary ideas and suggestions which hinted at the same, but in a much broader and generalized sense. The first non-cellular forms of life could have originated about 3 billion years ago; in the form of giant molecules, e.g. (���Q@Q@!��4 �Q�Hj3@�B¦j����\?�|4��5���?z�>iW��~d} ���W�sM;��We�o ��IukC��mӡ���'�b}:q�iܐ��)�QE QE QE QE QE QE QE QE QE QE QE QE QE QE QE QE9�uDR�� (�� (abiogenesis), but on today’s earth life comes only from the pre-existing life (biogenesis). Some salient points of Darwin’s theory are as follows: Organisms have unlimited capacity to reproduce: Organisms can reproduce offspring at a fast pace. “I can see no difficulty in a race of bears being rendered, by natural selection, more aquatic in their structure and habits, with larger and larger mouths, till a creature was produced as monstrous as a whale.“. Theory of Organic evolution: This is the latest and most scientific theory which said that in the beginning origin of life took place from simplest organic compounds but later from pre- existing life.

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