Final answer:
Amino acid sequences between two organisms can provide information about their common ancestors and evolutionary relationships.
Step-by-step explanation:
The amino acid sequences between two organisms can provide valuable information about their common ancestors and their evolutionary relationships. By comparing the amino acid sequences of proteins or the nucleotide sequences of DNA, scientists can infer the degree of similarity or divergence between organisms. The more closely related two organisms are, the more similar their amino acid sequences will be, indicating a more recent common ancestor. This information can help to construct phylogenetic trees and understand the evolutionary history of species.