Final answer:
The analogy compares liquid to milk and fat to a hippo, where liquid is a category of which milk is a part, and fat is a substance that is a significant part of a hippo.
Step-by-step explanation:
The student is given an analogy that compares liquid to milk as fat is to a hippo. To understand this analogy, we recognize that liquid is a general category which includes milk, just as fat is a category that includes the specific kind of fat found in a hippo. Milk is an emulsion of butterfat in water, where the fat is dispersed throughout the liquid. Similarly, fat in a hippo is stored in the animal's body, contributing to its bulk. Both milk and hippo fat consist of fatty substances, with milk containing a lipid molecule known as a triglyceride, and hippos having a significant amount of fat stored to provide energy and insulation.
Therefore, the analogy suggests a relationship of a part to the whole or a substance to the object it is a part of. This type of question is common in tests and quizzes to assess understanding of analogy and comparative relationships between different entities.