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81. How were mammals better than the other organisms?

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82. Describe three mechanisms by which genetic variability can be produced in nature.

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83. Discuss the role of variations in evolution.

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84. The homology in haemoglobin of man and gorilla is 99 per cent. What explanation would you give for this finding ?

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85. Differentiate apes and man.

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86. Name the biggest of the land reptiles.

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87. List the chronological sequence of evolution of genus Homo.

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88. Give important characteristics of the skull of Australopithecus.

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89. Name the man-like primates in the evolutionary history of man which started tool making?

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The discovery and taming of fire was one of the important landmark in the evolutionary history of man because of the followings :

1. Fire protected man from cold weather.

2. Fire protected man from wild beasts.

3. The cooking habits also changed with the help of fire, the man started cooking food.

4. Making of tools was made possible with the heat of fire.

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