Final answer:
The relationship between chimpanzees and humans is best described as homologous structures suggesting common ancestry.
Step-by-step explanation:
The best description for the relationship between chimpanzees and humans is homologous structures.
Homologous structures are structures that have a common function and suggest common ancestry. For example, the grasping hand found in both humans and chimpanzees is a homologous structure, indicating that humans and chimpanzees share a common ancestor that also had a grasping hand.
All mammals, including humans and chimpanzees, have limbs that have a similar basic pattern of bones inherited from a common ancestor. Although their forelimbs now have different functions, the similarity in limb structure suggests a common ancestry.