Answer:
The scientific theories can be framed on the basis of scientific evidence as well as their proofs.
To frame any scientific theory one has to follow the scientific procedure to reach the conclusion one of which is an investigation to provide the best evidence to support the theory.
The theory of evolution was proposed by Charles Darwin which stated that organism evolves from ancestors or descent with modifications. In favor of his theory, he presented the remnants of the past organism as well as the collected specimens form his voyage.