Q 6. differentiate between chemical and biological origin of life.
What is meant by geological time scale? Why is it necessary to determine the age of fossils?

Dear student,
To represent the geological time, geological timescale is constructed in which the history of earth, prior to human existence, is divided into time interval. The largest division is called eons, which span millions of years and eons are further divided into eras, periods and epochs. 
‚ÄčIt is important to know the age of fossils to determine the environmental conditions in which the organism was living, the type of habitat and also to know the evolutionary significance of the organism. It also helps in classifying organism on the basis of age record of the fossil.



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