1 Physical model refers to a model that intuitively expresses the characteristics of cognitive objects in the form of objects or pictures. Physical models include both static structural models, such as three-dimensional structural models of eukaryotic cells, and fluid mosaic models of cell membranes. It also includes dynamic process models, such as the model of chromosome changes during meiosis and the model of blood sugar regulation constructed by students in textbooks.

2. Mathematical model refers to a mathematical form used to describe a system or its properties, such as an experiment to explore the change of yeast population in culture medium.

3. Conceptual model refers to a model that abstractly summarizes the essential characteristics of things in words, such as the literal description of the same characteristics of eukaryotic cell structure, the explanation of the changes of matter and energy during photosynthesis, and the explanation model of Darwin's natural selection theory.