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