Fossils provide much evidence that evolution has occured. They show how animals bones have been similar to current animals. They also show how old prehistoric beasts can be, and how long ago they lived. Also from fossils we can find out alot from ecosystems, and how animals have changed from being primitive to more advanced. Fossils are a very important part of evolutionary studies.

	Homologous Structures are very similar structures found in very different animals. This also shows that organisms share a common ancestor. One main example is that all animals have eyes, and many organisms on earth such as the human, the bat, the alligator, and a monkey, use the same basic structure for arm/leg bones. This is almost a rock solid piece of evidence that evolution really has occurred.
	
	Vestigial Structures are things that are still in our bodies or in organism’s bodies that have no use. For example, the human appendix had no use whatsoever to us anymore, but we believe in history that humans may have used it to help digest their food. Another example is that a Cobra snake has toenails on the end of its body. It obviously has no toes, but maybe it used to.

	Embryology is a great similarity in the early development of organisms. Embryos of fish, rabbits, and humans as well as other animals, all look almost exactly alike at their first stage. They all have a tale, and even gills. This definitely shows that at one point, we were all very alike. Until evolution occurred.

	The second piece of evidence is called Common Biochemistry. This is where all living things are made of the same elements and they share a common DNA code. This indicates that all life evolved from a common ancestor with the same genetic code. This also shows that through mutations and natural selection, we have received the variety of life that we see on earth today. Common Biochemistry has been proven, considering all organisms do in fact share the same genetic code. This means we all evolved from a single organism, or group of organism.