Charles Darwin has two big themes in "About the Origin of Species". And it explains the similarity and adaptability of organisms. In order to explain the adaptability of living things and the myriad features that make them survive and propagate, Darwin (and Wallace) independently proposed a central theory of evolutionary process, natural selection. Natural selection provides insight into the reason why organisms are their way. Adaptability is a phenotypic variant that brings the highest adaptability in a particular variant set in a particular environment.
What is evolution, evolution? Evolution is the process of adapting different forms of living things from their initial form. Because biology is a study of life and evolution is how organism adapts to the environment, evolution is closely related to biology. "Evolution is a process that diversifies from the earliest forms of the history of the earth with the development of various kinds of organisms." Evolution occurs within species, not within individuals. Some people believe that evolution is a myth that lacks scientific evidence, others believe there is evidence to support it. Evolution of living things is thought to have been going on for the past three billion years.
Intelligent design has scientific basis. However, given the fact that it seems to be fashionable and complicated now, it seems to believe in evolution theory. Even those who do not know the topic have never considered evolutionary evidence.
The belief in the theory of evolution is an amazing phenomenon. There is no observable evidence of macroscopic evolution (ie evolution from different organisms to another), but it is still enthusiastically defended by scientific institutions. This strange situation is easily documented here, acknowledging that they lack evidence, quoting a recent statement by a leading evolutionist. These statements misrepresent that no significant scale evolution has occurred at this time, never occurred in the past and can not occur at all.