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Question 1

The loss of which species on the figure above would represent the loss of the most significant phylogenetic diversity?

Answer 1

A (the longest, most closest to the common ancestor branch, with no other branches coming off)

Question 2

If you could protect from extinction only the lineages derived from two of the nodes in the fig above (the one with woolly mammoth extinction and a phylogeny of paenungulata mammals), which pair would you save to yield the greatest phylogenetic diversity?

Answer 2

Nodes E & F (sister taxa Loxodonta africana A and B (E) and sister taxa Dugong dugon and Procavia capensis (F))