1. How do predation, parasitism and herbivory differ? Contrast all three.

2. Give examples of symbiotic and nonsymbiotic mutualisms. Describe at least one way in which a mutualism affects your daily life.

3. What is meant by the term “keystone species”? and what type of organism are most often considered keystone species?

4. Name 2 changes to Great Lake communities that have occurred since the invasion of the zebra mussel.

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