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Evolution

"Science (from the Latin scientia, meaning "knowledge") is an enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the natural world."
Wikipedia

"Theories may be expressed mathematically, symbolically, or in common language, but are generally expected to follow principles of rational thought or logic."
Wikipedia

"Unlike a mathematical proof, a scientific theory is empirical, and is always open to falsification if new evidence is presented. That is, no theory is ever considered strictly certain as science works under a fallibilistic view. Instead, science is proud to make predictions with great probability, bearing in mind that the most likely event is not always what actually happens."
Wikipedia

"First, why, if species have descended from other species by fine gradations, do we not everywhere see innumerable transitional forms? Why is not all nature in confusion, instead of the species being, as we see them, well defined?"
The Origin of Species Chapter VI