REVIEW QUESTIONS read of gla- pes in con- 1. In what important ways did inverteb
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REVIEW QUESTIONS read of gla- pes in con- 1. In what important ways did invertebrate life change between Ordovician time and Devonian time 2. What animals have the oldest extensive fossil record cooling. In unity, died in freshwater sediments? ecause the ted disap- ed to cool Devonian time? 3. In what way did terrestrial environments of the Late Devonian Period look different from those of Early low water of lime 4. What evidence do fossil bones and teeth provide vater, also that amphibians evolved from fishes? 5. Where was the landmass that now forms southern Europe toward the end of the Devonian Period? 6. How did the landmass that now forms the British Isles come into being? 7. tic ed to the pes. The Because How do reefs of middle Paleozoic age illustrate ecological succession? 8. Reefs are commonly porous structures that serve as traps for petroleum. If you wanted to drill for oil in De- vonian reefs, what geographic regions would seem most promising 9. What caused large quantities of sediment to ac- ide, the varming an cumulate in the south-central part of Euramerica during Baltica. a the Devonian Period? 10. What evidence is there of a decline in the concen- tration of atmospheric carbon dioxide during Devonian time? (Hint: Refer to Figure 10-11 and Earth System Shift 14-2.) 11. Land areas changed dramatically in the course of middle Paleozoic time. Using the Visual Overview on pages 330-331 and what you have learned in this chapter, describe how continental surfaces changed during Silurian and Devonian time with respect to their distribution on Earth, their topography, and their colonization by terres trial life. Eura- to east- geny? gave l thenExplanation / Answer
Both Ordovician and Devonian belong to Paleozoic Era
1- During the Ordovician period it saw a rapid increase in the invertebrate population such as trilobites, graptolites, and brachiopods. At the end of the Devonian period, however, two new extinction pulses occur, mainly affecting marine populations due to volcanic activity, lowering of water level due to African glaciation and change in the geochemistry of marine water. The first of these are the Rugose corals and stromatoporoids, the primary reef-builders of the period, which are nearly wiped out. Among the other marine invertebrate victims are brachiopods and trilobites.
2- The oldest extensive fossil record belongs to freshwater fishes or parastacid crayfish which was found in Australia.
3- Early Devonian was mostly occupied with the development of horsetails and ferns from the Silurian period whereas in Late Devonian saw the growth of many tall trees with trunks due to the formation of Lignin.
4- The skull bones of the earliest fish or Panderichthys was a rhipidistian is similar to the skull bones of the earliest tetrapod which forms the earliest class of extinct amphibians and reptiles.The teeth had infolding enamel which is similar to that of earliest tetrapods.
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