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Engineering HSC and IIT-JEE Mains and
Advanced videos. Hello students today we
are Studying in chapter origin and evolution
of life and in that we are Studying
topic Natural Selection now if it's a
natural selection I could say that
organisms who are the fittest or who can
fight are the ones that will survive
according to Darwin so let's try and
sign out a little bit more about it.
Oh Darwin's theory of natural selection
what he said was that organisms always
struggle to survive now
struggles were in the specific interests
sapciphik environmental all of them but
the theory of natural selection
precisely says that the fittest
organisms will survive the organisms who
struggle for existence allow them to do
variations but allow them to adjust
according to situations where the
organisms which were able to survive the
changing atmosphere on the earth did not
allow dinosaurs to itches or they
couldn't adjust to the changing
atmosphere that's the reason they extend
whereas cockroaches were able to attack
themselves or change themselves
according to variations that's the
reason they survived or they were termed
as natural selection survivors or
fittest survivors
natural selection now this phenomenal
natural selection was given by Darwin
and Herbert Spencer toned or coined this
term survival of the fittest both means
same now whenever organisms can do
favorable variations or adjustments
according to the environment or the
surrounding during their struggle to
survive or exist they have better
chances to survive or thrive in that
particular atmosphere for example if the
climate is changing if there is a
variation in air when climatic
conditions like draught or shortage of
water when the organism is fit to fight
the situations there are better chances
that its ancestors as well as this
processes are able to survive from
generation to generation
now organisms or survivors who actually
survive all the National calamities or
the man-made calamities for their
existence they produce certain favorable
variations or adjustments to that
environment and they could reproduce or
give birth and leave behind their
progeny or offsprings and now this
offsprings or progeny who were born as a
offset or you can say in the mechanism
of natural selection or survival of the
fittest but more fit they may go through
to fight themselves or to stay back and
possess all those qualities of variation
so students are going to Darwin's theory
of natural selection or survival of
fitters variations are a very important
clue or bringing adaptations in simple
sense are very necessary in order to
survive and sustain in a particular
atmosphere thank you
