define evolution?what are the factors affecting evolution and speciation?

Asked by APARNA PRAVEEN | 9th Mar, 2012, 11:50: AM

Expert Answer:

Evolution is any change across successive generations in the heritable characteristics of biological populations. 
The factors affecting evolution and speciation are geographical isolation, genetic drift and environment.

Answered by Meghna Thapar | 12th Mar, 2012, 11:42: AM

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