There is a term in many books that can be deceiving. Natural selection describes extinction of organisms, usually associated with environmental change. Natural selection only works with existing phenotypes which are developed from existing genetic information.
The process of natural selection cannot generate new information in the DNA; it only operates among previous existing characteristics. There are two scientific explanations for natural selection, neither of which explains to any new information or macro-evolution.
1) Sometimes, a previously lost characteristic reappears making it seem that something new evolved.
2) In other cases, a bacteria becoming resistant to antibiotics, some of the population in the species of bacteria already contain the necessary resistance. The vulnerable bacteria in the population are killed, allowing existing resistant varieties. It have less competition to become more prevalent.
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