A new study published in the journal Zoonomia has revealed the genetic similarity between all animals, showing that the genetic sequence of all mammals, birds, fish, and amphibians are closely related. The findings show that all animals share a common ancestor, and that genes are passed down through the generations in a shared evolutionary tree. This suggests that the genetic similarities between animals may be the result of common ancestry, rather than independent evolution. The study also found that the genetic similarities between animals were greater than previously thought, indicating that the evolutionary tree of life may be more intertwined than previously believed.

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source: Phys.org