In times like these, people are constantly craving good quality products. For example, people want wool that is nice and soft, or cows with higher, better quality milk yields. Natural selection has made certain sheep and cows who has these special characteristics, and farmers have had a "natural cloning" of sorts going on, by making these special animals procreate more, in hopes that their offspring have the same characteristics, and chances are they do. Now science steps in with mechanical cloning; a prime example is Dolly. Unfortunately the farmers’ method had 1 advantage over the scientific way: the animals made from natural selection were able to adapt to different kinds of environment, but animals made in labs would have the EXACT DNA structure of the donor, which means that the offspring would not be able to adapt to different environments. For example, if the perfect cow was discovered in, say, New Zealand, and it was cloned, its offspring would never be able to survive in any other country.