Examine the graphs in the Lab Book, and describe any trends you observe among kelp, purple sea urchin, and sea otter populations. What happened to all three populations when catastrophe struck the sea otters? Which populations were wiped out, and in what order? Why do you think the removal of the otters caused the other two populations to crash as well? Examine the graphs in the Lab Book. What happened to the populations’ growth patterns when 100 individuals of each species were reintroduced to the habitat? What would have happened if you had only reintroduced the kelp and the urchin? Explain. What if you had only reintroduced five individuals of each species? Would that have worked to restore the populations? Explain your hypothesis. Describe the results of the simulation. Was your hypothesis supported?

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