AD 4 0.0 / 5 ? BiologyCambrian ExplosionUniversityAll boards Created by: ellamarshall1Created on: 19-12-16 21:01 When was the ediacaran period of time? 635-542mya 1 of 10 Key features of bilaterians (3) Symmetrical, Triploblasty, cephalisation 2 of 10 3 main types of bilaterian protostomes lophotrochozoa, ecdysozoa, deuterostomes 3 of 10 How where organisms preserved in the burgess shale? deep sea bed buried by fine sediment so no o2 leads to preservation of C films and decay stopped due to different minerals/compounds present 4 of 10 How does fossilisation in ediacaran and cambrian change? low S and high alkilinity change so preservation in burgess shale, less fossilisation after cambrian, not much known pre cambrian 5 of 10 what are the possible causes of the cambrian explostion (3) Environmental changes, ecological changes or gene variation 6 of 10 What organisms are part of the total group classification? living representatives and all extinct relatives 7 of 10 What organisms are part of the crown group classification? living representatives and closely related organisms 8 of 10 what organisms are part of the stem group classification? only extinct organsims- they have closer relations to most common ancestor then living organisms 9 of 10 Name 8 different groups of organisms found in the burgess shale Porifora, annelida, mollusc, arthropoda, deuterostome, cnidaria, priapulida, onychophora 10 of 10
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