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Download Yr 12 ORIGINS OF LIFE ON EARTH MA File
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http://study.com/academy/lesson/the-origin-oflife-on-earth-theories-and-explanations.html ORIGINS OF LIFE ON EARTH The theory according to science today Primitive earth Water, Methane, Ammonia and Hydrogen are believed to be the first primitive molecules found on planet earth. The elements included in these molecules are: CARBON, OXYGEN, HYDROGEN & NITROGEN These four elements alone are capable of making complex molecules such as proteins, amino acids, DNA These elements according to theory joined to create the very first primitive cell. Evolution Timeline based on scientific theory THE FIRST LIFE FORMS TO APPEAR According to fossil record life appeared on earth around 3.8 billion years ago. These first life forms consisted of singe celled microbes ‘prokaryotes.’ More complex singe cells are believed to have evolved later, the ‘eukaryotes.’ PROKARYOTES AND EUKARYOTES Did eukaryotes evolve from prokaryotes? One prokaryote engulfs other single cells that turn out to be beneficial. The cyanobacterium can photosynthesise (make their own glucose like plants!) The aerobic bacterium can respire (make energy from oxygen and glucose The EUKARYOTIC cell The human body has over 50 trillion of these all working together as a team. The Plant Cell The incredible ability to create glucose (sugar) using sunlight, water and carbon dioxide. From single cells to multi cellular organisms Theory of Evolution according to Science
