d- ed 2. Wh in freshwater sediments? at animals have the oldest extensive fossil
ID: 291450 • Letter: D
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d- ed 2. Wh in freshwater sediments? at animals have the oldest extensive fossil record e3. In what way did terrestrial environments of the Late Devonian Period look different from those of Early Devonian time? 4. What evidence do fossil bones and teeth provide 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. 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- cumulate in the south-central part of Euramerica during 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.Explanation / Answer
2. The animals in freshwater that have oldest fossil records are Cary fish fossils, Jaw fish and bivalve molluscs. 3. In Early devonian there were no forests and tetrapods. The vegetation were small and was along the river. InLate devonian, forests were formed on land with high density and tetrapods were formed after the extinction of early formed fishes. 4.The evidences that the amphibians show that they were formed from the fish are lungs and bony limbed fins that were present in sarcopterygian fish and the flesh that were found in the same species. 5. Southern Europe was present as Laurasia in the late Devonian period and was stitched with the baltica. Massive mountains were formed as a phase for many years during this period.
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