Evolution: Unifying Theme In Biology

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The theory of evolution is a unifying theme in biology. A lot of things in biology revolves around evolution. Evolution is the explanatory framework. There are a lot of evidences that backs up the claim that evolution is a unifying theme in biology.
One evidence is fossil. Fossils are a record of life that existed in the past. Fossils can come in several forms ranging from preserved remains to permineralization . Scientists think about the age, location and what the environment was when they are studying fossils. The fossils found today show that they are not the same found from the past. They show a progress of evolution. Another evidence is DNA. DNA is the building block for living things. Scientist do not know how DNA became itself because