Evolution is considered a unifying theory of biology. It explains the unity and diversity of life. 1)Descents from a common ancestor explain the unity of life.
Biological evolution explains both the unity and the diversity of species and pro- vides a unifying principle for the history and diversity of life on Earth. Biological evolution is supported by extensive scientific evidence ranging from the fossil record to genetic relationships among species.
The major levels of organization in the body, from the simplest to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism.
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