fossilisation -the organisms are preserved and
FOSSILISATION -
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organic evolutionevolution is a slow continuous irreversible and natural process of change to give rise to advance and diverse forms of life ie
types of evolution -sequential evolution
laws rules -dollos law laws rules -dollos law
evidences of evolution -the evidences of organic evolution derived from many lines of study indicate that present day forms have arisen by gradual
fossilisation -the organisms are preserved and fossilized when they are buried in the ice in an oil rich soil in the lava of volcano in swamps in
types of fossils -snofossilexamplemode of formation1unalteredpreservationwooly mammoths 25000 yearsold ice in siberia mummies insectwhole bodies
palynofossils microfossils -fossils of planktons diatoms unicellular algae diatoms and shelled protozoans heliozoans radiolarian and foraminifera
mass extinction -since beginning many species evolved and got extinct in fact only 1 is livingsometimes it occured suddenly at large scale most
determination of the age of fossil -radioactive clock boltwood-1907 - half life of uranium is 45 billion yearsthis means half of total uranium
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