the process by which unrelated organisms with similar environmental demands evolve similar structures is convergent evolution.
Convergent evolution refers to the evolution of structures that are similar or 'analogous' in different lineages but cannot be credited to the emergence of a common ancestor; in other words, the fact that the structures are analogous does not represent homology.
Convergent evolution is the process by which organisms that are not closely related (not monophyletic) evolve similar traits independently as a consequence of having to adjust to similar environments or ecological niches.
The process by which distantly related organisms autonomously evolve similar characteristics to adapt to similar needs is known as convergent evolution. Convergent evolution produces analogous structures that have similar patterns or functions but were not present in those groups' last common ancestor. Homoplasy is the cladistic term for the same phenomenon.
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