In terms of ecological science, what is a "niche?" 2. Give a brief example of parasitism, mutualism, and symbiosis. If you have trouble finding examples, check the marine world, there are many such situations there. 3. E. O. Wilson noted that whenever a species becomes extinct, we have no idea what effect the loss of that species will have on the remainder of the gene pool in the long term. Explain what Wilson meant by that statement. 4. Why is a variety of species more desirable in an ecosystem than a single species? Give one example of the advantages of a multi-species system. There are 4 questions here. The recommended word count for each answer is 150 words.