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libellule said:
rocketpig,

just a little question to you :

I didn't get why small group of animals are required for effective evolution ?

thx

 Because for effective evolution you need a small group of isolated animals so the advantageous genes can spread throughout the entire group reasonably quickly, otherwise each advantageous gene would take forever to spread through the population and evolution would work far too slowly to show any significant changes.

 

At least thats my understanding of it.