When the video segment ends, go to video http://www youtubecom/watch2y mPEl8iiFE
ID: 290202 • Letter: W
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When the video segment ends, go to video http://www youtubecom/watch2y mPEl8iiFEp 6- What mode of life did this animal have? 7-What came first, the limbs or life in dry land? Dr.Jenny Clack answer iS 8-Follow the explanation Dr. Clack gives of the fossils she found, what is the array of bones she describes? 9- What is the evidence that Acanthostega was indeed a water animal? As Dr. Shubin points out, the basic pattern for limbs had been around for hundreds of million years, and the fin-to-limb transition took place in a series of small changes occurring over millions of years. An even earlier one occurred about half a billion years ago. Continue watching the video. 10- What is the Cambrian Explosion? 11 - What killed off the fauna of the Burgess Shale? 12 - In spite of their incredible diversity and, in some cases, almost alien looking appearance, what do all the burgess shale animals have in common?Explanation / Answer
Animal, (kingdom Animalia), any of a group of multicellular eukaryotic organisms (i.e., as distinct from bacteria, their deoxyribonucleic acid, or DNA, is contained in a membrane-bound nucleus). They are thought to have evolved independently from the unicellular eukaryotes. Animals differ from members of the two other kingdoms of multicellular eukaryotes, the plants (Plantae) and the fungi (Mycota), in fundamental variations in morphology and physiology.
****. an expert in the field of evolutionary biology. She studies the "fish to tetrapod" transition— the origin, evolutionary development and radiation of early tetrapods and their relatives among the lobe-finned fishes. She is best known for her book Gaining Ground: the Origin and Early Evolution of Tetrapods, published in 2002
**** . One of the interesting facts about Acanthostega is that paleontologists believe that it lived in the shallows of a swamp and that its legs had evolved for some other purpose other than walking on land. Some scientists think that this was primarily an aquatic creature who evolved certain features that were useful for living on land. Some paleontologists theorize that its jaws evolved so that the creatures could feed above water or on land while remaining in the water.
*** The Cambrian explosion or Cambrian radiation was the event of approximately 541 million years ago in the Cambrian period when most major animal phyla appeared in the fossil record. It resulted in the divergence of most modern metazoan phyla
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The fossil beds are in a series of shale layers, averaging 30 millimetres (1.2 in) and totalling about 160 metres (520 ft) in thickness. These layers were deposited against the face of a high undersea limestone cliff. All these features were later raised up 2,500 metres (8,000 ft) above current sea level during the creation of the Rocky Mountains.
These fossils have been preserved in a distinctive style known as Burgess shale type preservation, which preserves fairly tough tissues such as cuticle as thin films, and soft tissues as solid shapes, quickly enough that decay has not destroyed them. Moderately soft tissues, such as muscles, are lost. Scientists are still unsure about the processes that created these fossils. While there is little doubt that the animals were buried under catastrophic flows of sediment, it is uncertain whether they were transported by the flows from other locations,
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