Gravity is a "fact".
Things falling is an observation of the pull of bodies towards each other.
Bodies pulling towards each other is called gravity. (do you dispute any of these facts?)
Evolution is a "fact".
Fruit flies changing generation to generation is an observation of generational organism change.
Organisms changing generation to generation is called evolution. (do you dispute any of these facts?)
The "facts" of gravity require an explanation.
Aristotle and Galileo, created explanations of the "fact" of gravity. These are now obsolete explanations. Newton created an explanation which is substantially correct as far as it goes but turned out to require refinement.
Einstein's explanation, refining Newton's is currently the most accepted explanation of the "fact" of gravity.
The "facts" of evolution require an explanation.
Lamarckism, Transmutationism and Orthogenesis were created as explanations of the "fact" of evolution. These are now obsolete explanations. Darwin created an explanation which is substantially correct as far as it goes, but turned out to require refinement.
The Neo-Darwinist explanation is currently the most accepted explanation of the "fact" of evolution.
Gravity is a "fact" and a "theory."
Evolution is a "fact" and a "theory."
Things falling is an observation of the pull of bodies towards each other. Bodies pulling towards each other is called gravity. (do you dispute any of these facts?)
Reminds me of a conversation my high-school teacher had with one of the stubborn teen-age girls about gravity.
"What *is* gravity? Well, what attracts you towards me?"
Her riposte: "Absolutely nothing!"
Cheers!