BIOLOGY 197FH Study Guide - Quiz Guide: Late Devonian Extinction, Burgess Shale, Background Extinction Rate
13 Apr 2016
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Document Summary
One of the greatest adapive radiaions in the history of life on earth. All major divisions of animals appear in the fossil record quite suddenly about 0. 55 bya. Recognized by the sudden appearance of small shell fossils. Reason for modern interest in the cambrian explosion. Burgess shale one of the earliest fossil beds to contain sot part imprints. Marrella was the irst fossil collected by from the burgess shale. Causes of the cambrian explosion most likely involved the complex interacion of abioic and bioic processes. About 635 mya, the planet experienced a global freeze called. The oceans became increasingly oxygenated, which would trigger aerobic respiraion and the evoluion of larger body sizes. (earth systems) The origin of predator/prey relaionships created new niches. For example, organism hiding, which resulted in burrowing - released nutrients stored in the ocean loor. predatory adaptaions, adapive responses (ecological) Animals with a longitudinal plane of symmetry and specialized internal organ systems.
