Evolution is referred to as a scientific theory for several key reasons:
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There is lots of evidence to support it: The theory of evolution is backed by extensive evidence from various fields such as genetics, paleontology, biochemistry, and comparative anatomy. This body of evidence illustrates how species change over time and how they are related through common descent.
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It involves the formation of all living things on the planet: Evolution explains the diversity of life on Earth and provides a framework for understanding the biological processes that give rise to the myriad forms of life we observe, illustrating the relationships and common ancestry among organisms.
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It deals with topics that are completely testable in the laboratory: Many aspects of evolutionary theory can be tested and observed. For example, experiments can track genetic changes in populations over generations, study the effects of natural selection, or observe speciation events in real-time.
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Many scientists all over the world accept it as true: The overwhelming consensus among scientists is that evolution is a robust scientific theory. This consensus is based on the substantial body of evidence supporting it and the reproducibility of results in research.
In summary, evolution is termed a scientific theory because it is a comprehensive explanation of natural phenomena that is supported by evidence, is testable, and is widely accepted in the scientific community.