Question

a ladder is used to describe dna. what type of model is this?
mathematical
particle
graphical
analogy

Explanation:

This model uses a familiar object (a ladder) to describe the structure of DNA by drawing a comparison between the two, which is the core of an analogy model. Mathematical models use equations, particle models focus on subatomic/particle-scale representations, and graphical models rely on visual diagrams without direct comparative analogy to a common object.

Answer:

analogy