In general, the term '
evolution' can imply a drastic orgradual change from a very broad perspective. Life on earth, the universe,galaxies, as also the earth
in general have evolved through millions of years.
In this essay we consider only one aspect of
evolution emphasiz
ing on
evolutionas a biological tool for change among species and consider fossil record assupportive of both
evolution theories and also the other theories contrary to
evolution.
Evolution is the central unify
ing concept, a theory thatsuccessfully connects biology, paleontology and other branches of science.
Evolution is a gradual descent of organisms accompanied by changes that helpthe organisms to adjust and adapt to the surround
ings. 'Descent withmodifications' as Darw
in contended implies changes
in organisms
in successivegenerations (Mayr, 1976). These changes are triggered by the derivation of newspecies and there is a change
in the properties of populations of organisms andthese properties tend to transcend the lifetime of any s
ingle
individual. Newerspecies are modified versions of older species.