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Give examples to illustrate what are physical model, mathematical model and conceptual model.
Physical model: directly express the characteristics of cognitive objects in the form of objects or pictures, such as DNA double helix structure model and fluid mosaic model of cell membrane.

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

Mathematical model: a mathematical form used to describe the system or its properties, such as the schematic diagram of the influence of temperature (PH value) on enzyme activity, the cell cycle duration of different cells, etc.