4 Biological Evolution Unity and Diversity

Biological evolution is a unifying theory of biology. It provides explanations on the existence of unity and diversity of the species. Biological evolution is supported by extensive scientific evidence. Evidences such as fossil records; anatomical and morphological structures; appearances of embryos provide the credibility of evolution either from common or different ancestral lines. These days, new and different techniques, including DNA and protein sequence analyses, are used to test and further the understanding of evolutionary relationships. How does evolution occur? Evolution, which is continuous and ongoing, occurs when natural or artificial selection acts on the genetic variation in a population and changes the distribution of traits in that population gradually over multiple generations.