Question

scientists compile many pieces of evidence to infer evolutionary relationships. here is one such piece of evidence.
histone h4 is a protein in the nucleus that dna coils around to make chromatin, and it plays a role in gene activation by allowing transcription. in eukaryotes, it contains 103 amino acids. this table shows the number of amino acids in histone h4 that differ between three different eukaryotes: sun sea stars, plasmodial slime molds, and african clawed frogs.
which claim is best supported by this evidence?
of the three eukaryotes, african clawed frogs and sun sea stars are most closely related.
of the three eukaryotes, african clawed frogs and plasmodial slime molds are most closely related.
of the three eukaryotes, sun sea stars and plasmodial slime molds are most closely related.

Explanation:

In evolutionary biology, fewer amino - acid differences in a homologous protein (like histone H4) between two species suggest a closer evolutionary relationship. Here, African clawed frogs and sun sea stars have the fewest (2) amino - acid differences in histone H4 among the three pairs.

Answer:

Of the three eukaryotes, African clawed frogs and sun sea stars are most closely related.