Evolution is a scientific fact

I think the point my opponent was trying to make, is that macro evolution occurs when two animals from a different species mate to form another species. Like "A Chihuahua and a Great Dane", Or like a horse and a donkey, or a tiger and a lion. So when a donkey and a horse mate they form a hybrid. A.K.A. a honkey. That was a joke. Back to being serious. Hybrids are not fertile as my opponent clearly stated. But, this is not the case when it comes to macro evolution. Scientists do not claim that a change occurs on the "macro level" when two different species mate to form a new. The change occurs NOT when one generation of two animals make a hybrid, but when over a long period of time, animals who have certain traits that allow them to survive in a given environment, are passed down to offspring, slowly changing one species to another. "The Primary way that evolution occurs is through action of natural selection, that is, populations change in response to environmental pressures and they become adapted to new conditions and they change over time." http://www.youtube.com... Evolution-change in the gene pool of a population from generation to generation by such processes as mutation, natural selection, and genetic drift. So why is Macro Evolution a fact? "That life on Earth during the past 3 billion years has evolved from single-celled organisms to complex and diverse creatures, including humans, is a fact. This fact is based on the recorded and published observations of thousands of scientist over the past 200+ years. It is evidence clearly written in the geological and biological record. The observation that evolution has occurred is now as clear and undeniable as the Earth circling the sun, or that matter is made of atoms, or that the Earth's continents move...Evolution stands as a fully documented observation, as real as the observation that the sun circles the Earth or that matter is composed of atoms. Today, evolution of life on Earth stands as a fact. " http://chem.tufts.edu... In other words, this is scientific fact. "any observation that has been repeatedly confirmed and accepted as true; any scientific observation that has not been refuted " Evolution has not been proven wrong and has substantial evidence to support it. You might still be thinking "Well yeah but you still can't see the process of macro evolution happening." Well, "The primary function of science is to demonstrate the existence of phenomena that cannot be observed directly. Science is not needed to show us things we can see with our own eyes. Direct observation is not only unnecessary in science; direct observation is in fact usually impossible for the things that really matter. In fact, the most important discoveries of science have only be inferred via indirect observation. Familiar examples of unobservable scientific discoveries are atoms, electrons, viruses, bacteria, germs, radio-waves, X-rays, ultraviolet light, energy, entropy, enthalpy, solar fusion, genes, protein enzymes, and the DNA double-helix" In evolution there is a theory to support how it works, just as there is a theory to support gravity. but no one ever says, "gravity, its just a theory." "Evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts don't go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's in this century, but apples didn't suspend themselves in midair, pending the outcome. And humans evolved from ape-like ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered." http://www.talkorigins.org...