Question

how can multiscale models be helpful to engineers and scientists? by simplifying all systems to one scale by providing unique information at different scales by eliminating the need for experiments by making systems more complex

Explanation:

Multiscale models offer insights at various scales. They don't simplify all to one scale, can't eliminate experiments, and don't aim to make systems more complex. They provide unique info at different scales.

Answer:

By providing unique information at different scales