The organisms have similar genes that creates the bones. They all have is calcium in common, even worms have calcium, specifically in their setae. That setea is then transformed into a skeletal structure. When we look at the genetics and the bone structures. We can see the similarities between each organisms. Most organisms have a 1 bone, 2 bone, and many bones structure. This means that all organisms have similar ancestors and they came from a certain organism and evolved from them.
When comparing the anatomy, it can tell us the relations it has towards other species and their common ancestors. Comparing anatomies can prove that evolution from a common ancestor is true. The common anatomies can also tell us about the functionality of the species when comparing.
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European Rabbits
Frog
Earthworms
Humans
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