Organisms with similar physical characteristics are related through homologous structures and a shared evolutionary history.
In biology, organisms with similar physical characteristics are related based on homologous structures, which are features that overlap morphologically and genetically due to evolutionary history. For example, the bones in the wings of bats and birds exhibit homologous structures, indicating a close evolutionary relationship.
Similarities in molecules like DNA can also be used to group related organisms, showcasing a common evolutionary history for all life on Earth. These similarities highlight the shared evolutionary history of all known organisms, regardless of their differences in appearance.
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