Why would you use a model, instead of the actual object?

You would use the model, instead of the actual objects, because in some circumstances the object is too large or not in your possession. Examples would include cars, statues, etc..

the answer can be "credo" it means to believe = the word credo means "an official statement of beliefs"

when making an inference, the reader should be sure to support the inference with

evidence

a is an educated guess about what will happen.

c. prediction

when new information proves that a reader's prediction is wrong, the reader should

make a new prediction based on the new information.