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.

From the data provided:

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.

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.