SCI-275 WK3 CP1 - disturbance in the ecosystem by changing...

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Succession and Natural Selection CheckPoint After viewing the ecosystem presented in the succession animation and reading the descriptions on primary and secondary succession. I have come to the conclusion that the ecosystem is a secondary succession. The text in chapter 6 describes primary succession as “the change in species composition over time”; which was not the case with the ecosystem in the animation. The ecosystem in the clip showed a habitat that already had some soil and life growing in it. I chose the secondary succession because the text describes it as “the change in species composition that takes place after some disturbance destroys the existing vegetation”. Since there already was a habitat with life in it, when the beavers created the dam it changed the natural flow of the habitat. Thus, this caused a
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Unformatted text preview: disturbance in the ecosystem by changing and destroying some of the life in the environment. The salamander shown in question 9 brought to mind the natural selection section of chapter 6. This text brought me to the conclusion, that the salamander displayed with no hind limbs and very tiny forelimbs is this way because of natural selection. The two aspects of natural selection I feel this is an example of would be overproduction and variation. The manner in which the salamanders environment changed causes the species to change and adapt as well. Variation was brought to mind also because not all creators are created exactly the same, therefore the salamander shown in the image can all just be a variation found in a new habitat....
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