wk 3 assi. - land A salamander would use its back legs to...

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View the ecosystem succession in the animation. Is it primary or secondary? Explain your answer. I believe that it is secondary succession because when looking at the animation I observed that after the beaver made the dam for their lodge the small stream of water running through the forest grew bigger and bigger and in turn it killed the trees and vegetation around it. When the water started to go down the ground underneath was different (turned into a bog) and perhaps the seeds from the dead trees were still lingering around and different trees eventually grew back. Although most salamanders have four legs, the aquatic salamander shown below resembles an eel. It lacks hind limbs and has very tiny forelimbs. Propose a hypothesis to explain how limbless salamanders evolved according to Darwin's theory of natural selection. The salamanders that lived near water had to evolve since they came from smooth flat
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Unformatted text preview: land. A salamander would use its back legs to climb rocks or trees to get food, but this salamander slithers like a snake on land and can swim in water. Having backs legs would make it harder for it to move that quick. As for a salamander to who has all four legs they can run and climb to get away from predators and they can dig for their food. These salamanders may not do well in water because they would move slower than the salamanders that have evolved and adapted better to aquatic living. Most animals and human will adapted to their surroundings. Like some humans if they live in a cold climate a person will turn up the heat in the house and put on warmer clothes. Same goes with animals they will grow their winter fur for the colder months and shed it when it gets warmer out. Everything and everyone has to adjust to the surrounds where they live enable to survive....
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This note was uploaded on 11/06/2011 for the course ACCT 231 taught by Professor Shan during the Spring '10 term at Allen University.

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