A scientist is performing an investigation using biochemistry. She compares the protein sequence of an unknown species to the protein sequences of four known species. Her data is shown in the table. The scientist claims that all living organisms are related by way of common descent. The comparison of which two species BEST supports her claim?

species I and species III

species II and species IV

the unknown species and species IV

the unknown species and species II

Based on the similarity in protein sequence, the most closely related species are unknown species and species IV.

Which species are related by way of common descent?

From the data provided:

Unknown species: ACT GCA CCCSpecies I: ACA GCA CCG Species II: ACT GGT GGASpecies III: ACA GCA GGGSpecies IV: ACT GCA CCG

Based on the similarity in protein sequence, the most closely related species are unknown species amd species IV.

Therefore, the most closely related species are unknown species and species IV.

Learn more about protein sequence at:

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