Final answer:
Chimpanzee and Human, Chimpanzee and Gorilla are the most closely related organisms.
Step-by-step explanation:
The two organisms that are most closely related are:
- Chimpanzee and Human: Humans and chimpanzees share about 98% of their genes, indicating a recent common ancestor.
- Chimpanzee and Gorilla: Chimpanzees and gorillas also share a high percentage of genetic similarity, suggesting a close evolutionary relationship.
These examples demonstrate how DNA similarity can be used to determine the closeness of evolutionary relationships between different organisms.