Describing the flow of blood around the human body being like water flowing through pipes is an example a. an analogy b. a prototype c. a physical model d. a mathematical model

The correct answer is a)

An analogy is the similarity between two words or concepts.

That is, it is a term that indicates a relation of similarity between two different things. Or a comparison between objects, concepts or experiences. For example: "the wings are to the bird as the legs to the human"

Analogies in grammar, also called verbal analogies, are divided into 2 classes: symmetric and asymmetric analogies.

The symmetric analogies are interchangeable to the equivalent being, however, the terms of the asymmetric analogies are related but do not indicate similarity

a. the moon was locked into orbit by the earths gravity as it was passing by and capture hypothesis i think