Usually, vestigial structures are formed when a lineage experiences a different set of selective circumstances than its ancestors, and selection to maintain the elaboration and function of the feature ends or is greatly reduced. Information on controversies in the public arena relating to evolutionĪ vestigial structure is a feature that a species inherited from an ancestor but that is now less elaborate and functional than in the ancestor.Alignment with the Next Generation Science Standards.The big issues – Pacing, diversity, complexity, and trends.Macroevolution – Evolution above the species level.Microevolution – Evolution within a population.Mechanisms: the processes of evolution – Selection, mutation, migration, and more.The history of life: looking at the patterns – Change over time and shared ancestors.An introduction to evolution: what is evolution and how does it work?.
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