The Big Bang theory makes a variety of predictions that have been borne out by observations. For example, it predicts that hydrogen and helium would be the only elements created in appreciable quantities in the early universe, and indeed we observe that the oldest stars contain only very small amounts of heavier elements. Creationists often claim that evolution is not a very important part of biology, but nothing could be further from the truth. Evolution is easily observed in the laboratory, for instance when bacteria evolve resistance to a particular antibiotic. The fossil record shows, for example, how birds evolved from dinosaurs.
Evolution makes many definite predictions that have been borne out by observation.
For instance, evolution predicts that many sophisticated body parts in animals must have evolved from previous structures that worked differently or had different purposes, sometimes resulting in clumsy or maladaptive traits. One example is the vertebrate eye's maladaptive blind spot, where the optic nerve passes through the retina. Squids, on the other hand, have eyes in which the nerve endings connect on the back of the retina, so they have no blind spot. Such evolutionary accidents make perfect sense in terms of evolution, but are difficult to reconcile with the idea of intelligent design. This compromise approach to evolution is spreading more and more into the popular consciousness now that traditional creationism has suffered so many embarrassing defeats.