InterviewSolution
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InterviewSolution
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What are fossils ?(b) Describe two methods of determining the age of fossils. |
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Answer» Solution : PRESERVED traces of living organisms are called fossils. Fossils FOUND closer to the surface of EARTH are more recent in origin than the fossils we find in DEEPER layers. Fossils also help us to find evolutionary relation between organisms. (b) Age of the fossil can be estimated by: (i) Digging the layers of the earth - deeper the fossil, older it is and nearer the surface would be more recent ones. (ii) Studying the AMOUNT of `C_(14)` (radioactive isotope of C) in the fossils. Since it has half life, therefore by quantitative analysis we can give approximate time period when that organism would have existed. |
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