Question

evidence of evolution: molecular biology
what are vestigial structures? what are homologous structures?
circle the vestigial structure on the whale skeleton below.
in what ways do vestigial structures provide evidence for evolution?

Explanation:

Vestigial structures are remnants of organs or structures that had a function in an early ancestor. Homologous structures are anatomical features in different organisms that share a common evolutionary origin, often with similar underlying bone structures but different functions. Vestigial structures provide evidence for evolution as they show that organisms have changed over time. For example, if an organism has a vestigial structure, it implies that in its evolutionary past, that structure was functional. As the organism's environment and lifestyle changed, the structure lost its function but remained (in a reduced form), indicating a evolutionary history of change.

Answer:

• Vestigial structures: Remnants of once - functional organs/structures from ancestors.
• Homologous structures: Anatomical features with common evolutionary origin (same basic structure, different or same functions).
• Vestigial structures as evidence: Show evolutionary change (once - functional, now non - or less functional due to evolutionary adaptations).