Evolution and natural selection Show Evidence for evolution: anatomy, molecular biology, biogeography, fossils, & direct observation. Evolution and natural selectionBiology is brought to you with support from the Amgen Foundation If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. What is similarity of structures due to common ancestry called?Homologous structures
If two or more species share a unique physical trait they may all have inherited this trait from a common ancestor. Traits that are shared due to common ancestry are homologous structures. The similar bone arrangement of the human, bird, and whale forelimb is a structural homology.
What type of structures can be used to imply common ancestry?Homologous structures are structures that have a common function and suggest common ancestry. For example, homologous structures include the limbs of mammals, such as bats, lions, whales, and humans, which all have a common ancestor.
What shows how organisms are related by descent from common ancestors?DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.
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What is used to show similarities in genes or structures that are inherited from a common ancestry?
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