ROOM 01 · INTERPRETIVE THREAD

How Does Life Evolve?

Reading Deep Time

DEEP TIME INTERPRETATION

Source Institution: Smithsonian National Museum of Natural History

Source Exhibit: David H. Koch Hall of Fossils - Deep Time

Source Url: https://naturalhistory.si.edu/visit/virtual-tour/current-exhibits/deep-time-virtual-tour-fossil-list

Source Kind: interpretive_topic_or_panel

Use: research inspiration only; SAGE will write original interpretation

Dossier Status: scientifically_enriched_concept_room_01

Plain Language Explanation: Evolution is change in inherited characteristics of populations across generations. Individuals vary, some variation is heritable, and different variants may leave different numbers of descendants. Natural selection is one mechanism of evolution, but mutation, genetic drift, migration and other processes also change populations. Over enough time, lineages can diverge and new species can arise.

Evidence: Fossils document organisms appearing, changing and disappearing through successive rock intervals.; Comparative anatomy identifies inherited structural similarities among organisms.; DNA provides an independent record of relationships among living organisms.

Examples From Collection: Room 1 specimens span microbial life, plants, amphibians, synapsid traces and mammals, illustrating that Earth's history contains many branching lineages rather than one sequence.; Apateon pedestris; Miniochoerus sp.

Common Misconception: Evolution does not work toward a predetermined goal, and modern species are not arranged from 'lower' to 'higher.' Living species occupy branches of an evolutionary tree.

What Scientists Still Debate: Scientists broadly agree that evolution occurs and that all life shares evolutionary history. Active research concerns the exact relationships, timing and mechanisms involved in particular evolutionary transitions.

Sources: https://humanorigins.si.edu/education/introduction-human-evolution; https://humanorigins.si.edu/evidence/genetics

Enrichment Method: SAGE original interpretive concept; source title retained; evidence separated from reconstruction and open questions