Released STAAR Biology EOC · 2026 · Item 1 · 1 point
Walkthrough: Biology 2026, Item 1
B.9A · Evolution & Natural Selection · unscored study
Based on the amino acid sequences shown, which species is MOST closely related to the unknown species?
| Species | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| Unknown | Tyr | Val | Pro | Leu | Phe | Ser |
| R | Trp | Leu | Val | Trp | His | Ile |
| S | Ile | Asn | Arg | Leu | Asn | Ser |
| T | Tyr | Val | His | Leu | Asn | Ile |
| U | Ile | Leu | Arg | Cys | Thr | Ser |
- Species R
- Species S
- Species T
- Species U
1. Understand the question
You are comparing amino acid sequences. Species with more matching amino acids in the same positions share a more recent common ancestor.
Try the question on your own first, then reveal one step at a time.
2. Solve it step by step
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