BIO 101 Chapter Notes - Chapter 16: Molecular Clock, Vestigiality, Tetrapod
16 Nov 2016
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Vertebrate: an animal w/ a bony or cartilaginous backbone. Theory of evolution: darwin calls descent w/ modification , combines conc. s about life: Species we see today: result of natural selection operating over millions of years (org. s have changed over time: supported by a wealth of evidence. Fossils: preserved remains/impressions of once-living org. s that provide a record of past life on e, not all org. s: equally likely to form fossils, can be dated directly or indirectly. Younger fossils: more similar to modern org. s than older fossils: fossils form only in certain circumstances. Not every org. that dies forms a fossil. More likely to fossilize w/ bony skeletons or hard shells. Must be covered quickly upon death or create an imprint in special types of sediment: fossil record: An assemblage of fossils arranged in order of age, providing evidence of changes in species over time: paleontologist:
