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(a) What do you understand by the term ‘variation’ ?

(b) Name two human traits which show variation.

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(a) The differences in the characters among the individual of a species is called variation.  

(b) Human height and free ear lobe are the traits which show variation in humans.

(c) Due to the creation of variations, a species can adjust to the changing environment around  it. And this promotes the survival of the species in the changing environment.

Example: 

The  accumulation of ‘heat resistant’ variation (or trait) in some bacteria will ensure its survival even  when the temperature in its environment rises too much due to a heat wave or some other  reasons. On the other hand, the bacteria which did not have this variation to withstand heat  would not survive under these circumstances and die.

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