Question 1: On the basis of these data, which group of robins most likely shares a most recent common ancestor
with the Norfolk Island robins?

Hello. You forgot to enter the necessary data for this question to be answered. The data are shown in the figure attached below:

Red-capped Robin is the group of Robins that share a more recent common ancestor with the Norfolk Island robins.

Explanation:

Red-capped Robin is the group of Robins that share a more recent common ancestor with the Norfolk Island robins, this can be seen by the degree of genetic similarity between these two species, since the Red-capped Robin has 98.2% of genetic similarity .

When two species have the same common ancestor, these species have great genetic similarity and the more recent this ancestry is, the greater the genetic similarity between the species.

format change of dna.  

b.have there own function.