The theory of evolution by natural selection is a scientific theory that explains how species change over time through the process of natural selection. It proposes that organisms that are better adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to their offspring. This theory is supported by a large body of evidence, including fossil records, comparative anatomy, and genetics.

Intelligent design, on the other hand, is a belief that certain features of the natural world are best explained by an intelligent cause rather than natural processes. It suggests that complex biological structures and processes, such as the human eye, are too complex to have evolved through natural selection alone, and must have been designed by an intelligent being. Intelligent design is not considered a scientific theory because it is not testable or falsifiable through empirical observation and experimentation, and it relies on supernatural explanations.

In summary, the main difference between the theories of evolution by natural selection and intelligent design is that evolution is a scientific theory supported by evidence, while intelligent design is a belief that relies on supernatural explanations and is not considered scientific.
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