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Unit 8 Essay Prompts Sorry guys that this is so late... I just had to go to sleep. Anyways, this guide is to help  inspire you about the essay prompts and provide a  little info, you'll have to do additional  research on your own. Also, I'll try to bring up better examples. 1) Explain and illustrate with one specific example of each of the following concepts: a) competitive exclusion (Gause's principle) 1. definition = states that when two species with the same resource needs are put  into the same environment, the species that is able to use its resources better  and more efficiently will cause the other species to eventually become  extinct. 2. example = the experiment involving two species of protozoans (pg. 1115) b) ecological succession 1. definition = transition in the species composition of a biological community,  often following ecological disturbances of the community 2. example = lichens and mosses are usually the pioneering species that  facilitate the land for later species during primary succession 3. example = a forest are that has been cleared may return to a forest if left  alone, that's secondary secession 4. R-selected populations usually are involved in the early processional stages  and later other better competitors slowly become established in the same  place.
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