Question
- How does the study of fossils help to understand evolution?
- How did SL Miller provide an experimental evidence in favour of Oparin and Haldane's hypothesis? Explain.
✓
Answer
- Fossils help in tracing the organic evolution in following ways:
- Fossils represent modes of preservation of ancient species.
- Fossils help in establishing evolutionary traits among organisms and their ancestors.
- Fossils help in establishing the time period in which organisms lived.
- Fossils provide good evidence of the structure and lifestyle of animals (and even plants) from the past.
- They provide a record of the remains of long-extinct species.
- Miller Urey Experiment:
- They replicated the environmental and atmospheric conditions that may have existed in the primitive earth in their lab by taking gases like methane, ammonia, hydrogen and water vapour in a closed vessel.
- When they came back to check the results of their experiment after a week, they detected the presence of amino acids, nitrogen bases, fats, and sugar.
- With these results, the theory of gradual chemical evolution was accepted.
- This experiment gave the other scientists to piece the remaining pieces together.
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