Evolution
DESIGNED
By
Edustudy point
, Evolution: The process of gradual modification of simpler forms into the present complex
forms over millions of years is called evolution.
Origin of life: A scientific theory called big bang theory explains that, the
unimaginable large explosion created the universe.
• As the universe expanded and cooled, the temperature came down and materials
condensed under the influence of gravitation to form present day galaxy.
• Our galaxy is called Milky Way formed 4.5 billion years back.
• Water vapour, methane, carbon dioxide and ammonia released from molten mass
covered the surface.
• The UV rays from the sun broke up water into Hydrogen and Oxygen and the lighter H2
• Oxygen combined with ammonia and methane to form water, CO2 and others.
• The ozone layer was formed, as it cooled, the water vapor fell as rain, to fill all the
depressions and form oceans.
• Life appeared 500 million years after the formation of earth, i.e., almost four billion
years back.
Evolution of life forms- a theory: Conventional religious literature reveals
about the theory of special creation based on three connotations-
1) All living organisms were created as such.
2) The diversity in all organisms always the same since creation and will be the same in
future.
3) Earth is about 4000 years old.
All the ideas were challenged during 19th century.
• Charles Darwin concluded that existing living forms share similarities to varying degrees
not only among themselves but also life forms that existed millions of years ago.
• Darwin’s theory of natural selection is based on the fact that those who are better fit in
an environment, leaves more progeny than others and the progenies will survive more
hence are selected by the nature which he implied as mechanism of evolution.
DESIGNED
By
Edustudy point
, Evolution: The process of gradual modification of simpler forms into the present complex
forms over millions of years is called evolution.
Origin of life: A scientific theory called big bang theory explains that, the
unimaginable large explosion created the universe.
• As the universe expanded and cooled, the temperature came down and materials
condensed under the influence of gravitation to form present day galaxy.
• Our galaxy is called Milky Way formed 4.5 billion years back.
• Water vapour, methane, carbon dioxide and ammonia released from molten mass
covered the surface.
• The UV rays from the sun broke up water into Hydrogen and Oxygen and the lighter H2
• Oxygen combined with ammonia and methane to form water, CO2 and others.
• The ozone layer was formed, as it cooled, the water vapor fell as rain, to fill all the
depressions and form oceans.
• Life appeared 500 million years after the formation of earth, i.e., almost four billion
years back.
Evolution of life forms- a theory: Conventional religious literature reveals
about the theory of special creation based on three connotations-
1) All living organisms were created as such.
2) The diversity in all organisms always the same since creation and will be the same in
future.
3) Earth is about 4000 years old.
All the ideas were challenged during 19th century.
• Charles Darwin concluded that existing living forms share similarities to varying degrees
not only among themselves but also life forms that existed millions of years ago.
• Darwin’s theory of natural selection is based on the fact that those who are better fit in
an environment, leaves more progeny than others and the progenies will survive more
hence are selected by the nature which he implied as mechanism of evolution.
