Q. 18

According to Darw

Answer :

A colony of bacteria ‘A’ growing in a given medium has built in variation in terms of ability to utilise a feed component, a change in the medium composition would bring out only that part of the

Population, ‘B’ that can survive under the new conditions.

In due course of time this variant population outgrows the others and appears as new species thus organisms with shorter life-cycle or life-span will undergo evolution faster. For the same thing to happen in fish or fowl, it would take millions of years as life spans of these animals are in years.

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