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Prior to the arrival of Europeans, the common nightcrawler, an annelid worm, was absent from much of the North American continent. Apparently, it had been wiped out by the glaciers of the last Ice Age.
?Discuss how the introduction of earthworms to North America occurred in the so-called "Columbian Exchange."
?Based on what you researched, give your opinion about how it affected the environment.


"Extinction and Human Effects" Please respond to the following:

• Analyze the impact that the extinction of a species will have on an environment. Determine what you believe to be the most significant impact, and describe why.

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