Succession and Natural Selection

Succession and Natural Selection - below resembles an eel...

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Succession and Natural Selection CheckPoint The example in the succession animation would be considered secondary succession. Secondary succession is the change in a species composition that takes place after some form of disturbance has destroyed the existing vegetation. The soil must already be present for this to occur. This happened because beavers created a dam which turned the small river into a large pond, that in turn ended up killing most of the trees and other vegetation in that area. Now it will take over a hundred years for secondary succession to take place, creating a new ecosystem in that area. Question 9: Although most salamanders have four legs, the aquatic salamander shown
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Unformatted text preview: 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. There are four premises of natural selection, over production, variation, differential reproductive success, and limits on population growth or struggle for existence. The limbless salamander is an aquatic creature, it doesn’t need to go to land, so it eventually shed its hind legs and it’s so it can gain speed in the water, its forelegs shortened and now work as fins like on a fish, giving the salamander an advantage in the water....
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This note was uploaded on 10/27/2010 for the course SCI SCI/245 taught by Professor Daniellejannusch during the Spring '10 term at University of Phoenix.

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