Question

a scientist might use a model to represent objects he or she cannot see with the unaided eye. because scientists cannot form hypotheses without first building a model. because he or she must follow every step of the scientific methods. because it is the only way to learn about the natural world.

Explanation:

Models in science are used to represent things that are too small, too large, too far - away, or otherwise not directly observable with the unaided eye. They help scientists understand and communicate about these objects.

Answer:

to represent objects he or she cannot see with the unaided eye.