Common ancestry and continuing evolution Show
The theory of evolution is supported by instances of direct observation, the existence of homologies and fossils, and certain biogeographical patterns. Common ancestry and continuing evolutionBiology is brought to you with support from the Amgen Foundation AP® is a registered trademark of the College Board, which has not reviewed this resource. How are similarities in body structure between different species evidence of evolution?Similar body parts may be homologous structures or analogous structures. Both provide evidence for evolution. Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor. These structures may or may not have the same function in the descendants.
How do similar skeletal structures among diverse species support the theory of evolution?Homologous structures provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features). Similarities and differences among biological molecules (e.g., in the DNA sequence of genes) can be used to determine species' relatedness.
Is the similarities in the body structures of different species which may have come from common ancestors?Homologous features
If two or more species share a unique physical feature, such as a complex bone structure or a body plan, they may all have inherited this feature from a common ancestor. Physical features shared due to evolutionary history (a common ancestor) are said to be homologous.
What are similar structures that evolved from a common ancestor?Homologous structures are similar structures that evolved from a common ancestor.
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What do the similarities between the skeletal structures of these three species most likely indicate about their evolutionary history?
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