Secrets of the Seaweed 2011 Question 2

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Challenge Question 2

Figure 1 shows a phylogenetic tree illustrating genetic variation within the single species Durvillaea antarctica. Explain what the diagram tells you about the variation shown within the species. Do you think this bullā€kelp should be treated as one, or several, species? (Do you feel you have enough information to make this decision, and if not, what other information might you require?)