Explain why scientific theories such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record?

Fossils provide evidence that organisms that were found before are not the same ones that are found today. Fossils show the progression in Evolution. These constitute the Meta morphological or anatomical records. Biological and chemical evolution is the means of comparing the anatomies of both the extinct and modern species.

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many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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