The theory of organic evolution's central thesis is that most present-day organisms are related, and that they have changed with time.
The theory of organic evolution is based on the understanding that organisms are diversified from each other due to the genetic changes which arise in them over time.
This theory of evolution suggests that all organisms originated from a common ancestor. With time, changes in the DNA caused more diverse groups of organisms to be formed. As all organisms originated from a common ancestor, hence they are related.
Those organisms with better qualities are able to pass their genes to their offspring and the ones who cannot cope with the environmental changes become extinct over time. Hence, this leads to the organisms changing over time.
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