29. What are fossils? What do they tell us about the process of evolu
30. What is a good source of energy?
2
31. Why are we looking at alternate sources of energy?
2
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Explanation:
29)fossils are animal and plant traces which are ancient and help in giving information about evolution.
30) good source of energy which has
- high calorific value
- burn completely
- is environmental friendly
31) we are looking for alternative source because after some years the fsosil fuels would get exhausted by humans.
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