Evolution of life n earth

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Evolution of life n earth

  1. 1. PSYCHOLOGY EVOLUTION OF EARTH & LIFE ON EARTH
  2. 2. EVOLUTION OF EARTH <ul><li>About 6 billion years ago, a glowing part of the sun in the form of a fiery ball of fire separated from it. </li></ul><ul><li>Gradually it cooled down and formed the present planet earth. </li></ul><ul><li>However the interior of the earth is still burning hot. </li></ul>
  3. 3. EVOLUTION OF EARTH <ul><li>Due to tectonic forces, hills and mountains formed on the earth. </li></ul><ul><li>During the early period earth could not support life. </li></ul><ul><li>The surface was hot and the atmosphere was filled with gases of various kinds </li></ul>
  4. 4. EVOLUTION OF LIFE ON EARTH <ul><li>About 4 billion years ago, the earth cooled sufficiently to permit water to condense and form rivers, lakes, seas. </li></ul><ul><li>About 3.5 billion years ago, certain gases in the atmosphere came together and formed the first living form in water. </li></ul>
  5. 5. FIRST LIVING BEINGS <ul><li>The first living beings were single celled organisms. </li></ul><ul><li>Later during the course of time other multi-cellular forms emerged from the single-celled organisms. </li></ul>
  6. 6. HIGHER ORGANISMS <ul><li>Gradually organisms with complex body organisation like fishes, amphibians, reptiles, birds and other animals including humans emerged. </li></ul>
  7. 7. GLACIAL AGE <ul><li>During the glacier age or ice age climate was not suitable for the survival of many organisms. </li></ul><ul><li>The organisms that could not survive became extinct and only the fittest survived and continue to exist. </li></ul>
  8. 8. PROCESS OF CHILD BIRTH IN HUMANS <ul><li>The process of childbirth starts from the moment of fertilization (a sperm from the male fuses with the egg of the female) and results in the embryo developing into a foetus. </li></ul>
  9. 9. STAGES OF FOETUS FORMATION <ul><li>Fertilization and zygote formation </li></ul><ul><li>Implantation of embryo and its development </li></ul><ul><li>Placenta formation </li></ul><ul><li>Child birth </li></ul>

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