What are the limitations of Gina's model?

Initial research suggests that a new animal species that’s entered the area caused the damage. So, Gina draws a model to show her colleagues what’s happening. Further research suggests that the animal has carried a bacteria that has infected the trees, causing the damage. What are the limitations of Gina’s model?

It doesn’t take all factors into account.

It isn’t drawn to scale.

It’s a mathematical model, not a conceptual model.

It needs to be a physical model, not a conceptual model