Evolution by natural selection probably started when cellular forms of life with minor differences in metabolic capability originated on the earth .
The essence of Darwinian theory about evolution is natural selection .The rate of appearance of new forms is linked to the life cycle or the lifespan .
Microbes that divide fast produce thousands of next generation show evolution and appearance of nw variants or even species much faster .
For the same thing to happen in a fish or frog of humans would take million of years as lifespans of these animals are in years .
Nature selects the fittest . Fittest are the individuals that are better adapted to survive in an otherwise hostile environment .
Adaptive ability is inherited . It has a genetic basis . Fitness is the end result of the ability to adapt and get selected by nature.
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