They call it "similarity" you should know that.
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Scientists may refer to similar structures as homologous structures, which are anatomical features that have a common evolutionary origin, despite potentially serving different functions in different species. These structures can provide evidence of a shared ancestry between different organisms.
Structures that are similar are called analogous structures. These structures may serve similar functions but have evolved independently in different species.
Similar structures that evolved independently are called convergent evolution. This occurs when different species adapt to similar environmental pressures and develop analogous traits, even though they do not share a common ancestor that had those traits.
Analogous structures are body parts that have a similar function in different species but have evolved separately, thus not sharing a common ancestor. These structures result from convergent evolution, where organisms adapt to similar environmental pressures.
A scientist that studies viruses is called a virologist.